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n | * New to integrated Gmail | n | * |
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n | Gmail | n | Google Workspace Admin |
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n | * Bulk email sending guidelines & tools | n | * Contact support / fix a problem |
| | | * Fix a problem |
| | | * Gmail issues |
| | | * Problems with sending |
| * Email sender guidelines | | * Email sender guidelines |
| | | |
| # Email sender guidelines | | # Email sender guidelines |
| | | |
| **Important:** Starting February 2024, Gmail will require the fol | | **Important:** Starting February 2024, Gmail will require the fol |
| lowing for | | lowing for |
| senders who send 5,000 or more messages a day to Gmail accounts: | | senders who send 5,000 or more messages a day to Gmail accounts: |
| Authenticate | | Authenticate |
| outgoing email, avoid sending unwanted or unsolicited email, and | | outgoing email, avoid sending unwanted or unsolicited email, and |
| make it easy | | make it easy |
| for recipients to unsubscribe. Learn more about requirements for | | for recipients to unsubscribe. Learn more about requirements for |
| sending 5,000 | | sending 5,000 |
| or more emails per day. | | or more emails per day. |
| | | |
| The guidelines in this article can help you successfully send and | | The guidelines in this article can help you successfully send and |
| deliver | | deliver |
| email to personal Gmail accounts. A personal Gmail account is an | | email to personal Gmail accounts. A personal Gmail account is an |
| account that | | account that |
| ends in @gmail.com or @googlemail.com. | | ends in @gmail.com or @googlemail.com. |
| | | |
| **Google Workspace senders:** If you use Google Workspace to send | | **Google Workspace senders:** If you use Google Workspace to send |
| large | | large |
| volumes of email, review the Spam and abuse policy in Gmail. The | | volumes of email, review the Spam and abuse policy in Gmail. The |
| policy is | | policy is |
| part of the Google Workspace Acceptable Use Policy. | | part of the Google Workspace Acceptable Use Policy. |
| | | |
| ## Sender requirements updates | | ## Sender requirements updates |
| | | |
| This table lists our updates to the sender guidelines: | | This table lists our updates to the sender guidelines: |
| | | |
| Sender requirement | Date added | | Sender requirement | Date added |
| ---|--- | | ---|--- |
| Use a TLS connection for transmitting email | Dec. 2023 | | Use a TLS connection for transmitting email | Dec. 2023 |
| | | |
| ## Sender guidelines | | ## Sender guidelines |
| | | |
| Follow these guidelines to help ensure messages are delivered to | | Follow these guidelines to help ensure messages are delivered to |
| Gmail | | Gmail |
| accounts as expected, and to help prevent Gmail from limiting sen | | accounts as expected, and to help prevent Gmail from limiting sen |
| ding rates, | | ding rates, |
| blocking messages, or marking messages as spam. | | blocking messages, or marking messages as spam. |
| | | |
| For more information about meeting these requirements, visit our | | For more information about meeting these requirements, visit our |
| Email sender | | Email sender |
| guidelines FAQ. | | guidelines FAQ. |
| | | |
| Requirements for all senders | | Requirements for all senders |
| | | |
| Starting February 1, 2024, all senders who send email to Gmail ac | | Starting February 1, 2024, all senders who send email to Gmail ac |
| counts must | | counts must |
| meet the requirements in this section. | | meet the requirements in this section. |
| | | |
| **Important:** If you send more than 5,000 messages per day to Gm | | **Important:** If you send more than 5,000 messages per day to Gm |
| ail accounts, | | ail accounts, |
| follow the Requirements for sending 5,000 or more messages per da | | follow the Requirements for sending 5,000 or more messages per da |
| y. | | y. |
| | | |
| * Set up SPF or DKIM email authentication for your domain. | | * Set up SPF or DKIM email authentication for your domain. |
| * Ensure that sending domains or IPs have valid forward and rev | | * Ensure that sending domains or IPs have valid forward and rev |
| erse DNS records, also referred to as PTR records. Learn more | | erse DNS records, also referred to as PTR records. Learn more |
| * Use a TLS connection for transmitting email. For steps to set | | * Use a TLS connection for transmitting email. For steps to set |
| up TLS in Google Workspace, visit Require a secure connection fo | | up TLS in Google Workspace, visit Require a secure connection fo |
| r email. | | r email. |
| * Keep spam rates reported in Postmaster Tools below 0.10% and | | * Keep spam rates reported in Postmaster Tools below 0.10% and |
| avoid ever reaching a spam rate of 0.30% or higher. Learn more ab | | avoid ever reaching a spam rate of 0.30% or higher. Learn more ab |
| out spam rates. | | out spam rates. |
| * Format messages according to the Internet Message Format stan | | * Format messages according to the Internet Message Format stan |
| dard (RFC 5322). | | dard (RFC 5322). |
| * Don’t impersonate Gmail From: headers. Gmail will begin using | | * Don’t impersonate Gmail From: headers. Gmail will begin using |
| a DMARC **quarantine** enforcement policy, and impersonating Gm | | a DMARC **quarantine** enforcement policy, and impersonating Gm |
| ail From: headers might impact your email delivery. | | ail From: headers might impact your email delivery. |
| * If you regularly forward email, including using mailing lists | | * If you regularly forward email, including using mailing lists |
| or inbound gateways, add ARC headers to outgoing email. ARC head | | or inbound gateways, add ARC headers to outgoing email. ARC head |
| ers indicate the message was forwarded and identify you as the fo | | ers indicate the message was forwarded and identify you as the fo |
| rwarder. Mailing list senders should also add a List-id: header, | | rwarder. Mailing list senders should also add a List-id: header, |
| which specifies the mailing list, to outgoing messages. | | which specifies the mailing list, to outgoing messages. |
| | | |
| Requirements for sending 5,000 or more messages per day | | Requirements for sending 5,000 or more messages per day |
| | | |
| Starting February 1, 2024, senders who send more than 5,000 messa | | Starting February 1, 2024, senders who send more than 5,000 messa |
| ges per day | | ges per day |
| to Gmail accounts must meet the requirements in this section. | | to Gmail accounts must meet the requirements in this section. |
| | | |
| * Set up SPF and DKIM email authentication for your domain. | | * Set up SPF and DKIM email authentication for your domain. |
| * Ensure that sending domains or IPs have valid forward and rev | | * Ensure that sending domains or IPs have valid forward and rev |
| erse DNS records, also referred to as PTR records. Learn more | | erse DNS records, also referred to as PTR records. Learn more |
| * Use a TLS connection for transmitting email. For steps to set | | * Use a TLS connection for transmitting email. For steps to set |
| up TLS in Google Workspace, visit Require a secure connection fo | | up TLS in Google Workspace, visit Require a secure connection fo |
| r email. | | r email. |
| * Keep spam rates reported in Postmaster Tools below 0.10% and | | * Keep spam rates reported in Postmaster Tools below 0.10% and |
| avoid ever reaching a spam rate of 0.30% or higher. Learn more ab | | avoid ever reaching a spam rate of 0.30% or higher. Learn more ab |
| out spam rates. | | out spam rates. |
| * Format messages according to the Internet Message Format stan | | * Format messages according to the Internet Message Format stan |
| dard (RFC 5322). | | dard (RFC 5322). |
| * Don’t impersonate Gmail From: headers. Gmail will begin using | | * Don’t impersonate Gmail From: headers. Gmail will begin using |
| a DMARC **quarantine** enforcement policy, and impersonating Gma | | a DMARC **quarantine** enforcement policy, and impersonating Gma |
| il From: headers might impact your email delivery. | | il From: headers might impact your email delivery. |
| * If you regularly forward email, including using mailing lists | | * If you regularly forward email, including using mailing lists |
| or inbound gateways, add ARC headers to outgoing email. ARC head | | or inbound gateways, add ARC headers to outgoing email. ARC head |
| ers indicate the message was forwarded and identify you as the fo | | ers indicate the message was forwarded and identify you as the fo |
| rwarder. Mailing list senders should also add a List-id: header, | | rwarder. Mailing list senders should also add a List-id: header, |
| which specifies the mailing list, to outgoing messages. | | which specifies the mailing list, to outgoing messages. |
| * Set up DMARC email authentication for your sending domain. Yo | | * Set up DMARC email authentication for your sending domain. Yo |
| ur DMARC enforcement policy can be set to **none**. Learn more | | ur DMARC enforcement policy can be set to **none**. Learn more |
| * For direct mail, the domain in the sender's From: header must | | * For direct mail, the domain in the sender's From: header must |
| be aligned with either the SPF domain or the DKIM domain. This i | | be aligned with either the SPF domain or the DKIM domain. This i |
| s required to pass DMARC alignment. | | s required to pass DMARC alignment. |
| * Marketing messages and subscribed messages must support one-c | | * Marketing messages and subscribed messages must support one-c |
| lick unsubscribe, and include a clearly visible unsubscribe link | | lick unsubscribe, and include a clearly visible unsubscribe link |
| in the message body. Learn more | | in the message body. Learn more |
| | | |
| If you send more than 5,000 emails per day before February 1, 202 | | If you send more than 5,000 emails per day before February 1, 202 |
| 4, follow the | | 4, follow the |
| guidelines in this article as soon as possible. Meeting the sende | | guidelines in this article as soon as possible. Meeting the sende |
| r | | r |
| requirements before the deadline may improve your email delivery. | | requirements before the deadline may improve your email delivery. |
| If you don’t | | If you don’t |
| meet the requirements described in this article, your email might | | meet the requirements described in this article, your email might |
| not be | | not be |
| delivered as expected, or might be marked as spam. To get help wi | | delivered as expected, or might be marked as spam. To get help wi |
| th email | | th email |
| delivery issues, go to Troubleshooting. | | delivery issues, go to Troubleshooting. |
| | | |
| To learn more about setting up SPF, DKIM, and DMARC, visit Preven | | To learn more about setting up SPF, DKIM, and DMARC, visit Preven |
| t spam, | | t spam, |
| spoofing & phishing with Gmail authentication. | | spoofing & phishing with Gmail authentication. |
| | | |
| ### Email authentication requirements & recommendations | | ### Email authentication requirements & recommendations |
| | | |
| We require that you set up these email authentication methods for | | We require that you set up these email authentication methods for |
| your domain. | | your domain. |
| Authenticated messages: | | Authenticated messages: |
| | | |
| * Help protect recipients from malicious messages, such as spoo | | * Help protect recipients from malicious messages, such as spoo |
| fing and phishing messages. | | fing and phishing messages. |
| * Help protect you and your organization from being impersonate | | * Help protect you and your organization from being impersonate |
| d. | | d. |
| * Are less likely to be rejected or marked as spam by Gmail. | | * Are less likely to be rejected or marked as spam by Gmail. |
| | | |
| Set up email authentication for each of your sending domains at y | | Set up email authentication for each of your sending domains at y |
| our domain | | our domain |
| provider. In addition to following the instructions we provide, y | | provider. In addition to following the instructions we provide, y |
| ou should | | ou should |
| also refer to your domain provider's email authentication instruc | | also refer to your domain provider's email authentication instruc |
| tions. | | tions. |
| | | |
| To verify messages are authenticated, Google performs checks on m | | To verify messages are authenticated, Google performs checks on m |
| essages sent | | essages sent |
| to Gmail accounts. To improve email delivery, we recommend that y | | to Gmail accounts. To improve email delivery, we recommend that y |
| ou always set | | ou always set |
| up SPF, DKIM, and DMARC for your domains. Make sure you're meetin | | up SPF, DKIM, and DMARC for your domains. Make sure you're meetin |
| g the minimum | | g the minimum |
| authentication requirements described in Sender Guidelines. Messa | | authentication requirements described in Sender Guidelines. Messa |
| ges that | | ges that |
| aren’t authenticated with these methods might be marked as spam o | | aren’t authenticated with these methods might be marked as spam o |
| r rejected | | r rejected |
| with a **5.7.26** error. | | with a **5.7.26** error. |
| | | |
| If you use an email service provider, verify that they authentica | | If you use an email service provider, verify that they authentica |
| te your | | te your |
| domain’s email with SPF and DKIM. | | domain’s email with SPF and DKIM. |
| | | |
| We recommend you always use the same domain for email authenticat | | We recommend you always use the same domain for email authenticat |
| ion and | | ion and |
| hosting your public website. | | hosting your public website. |
| | | |
| #### SPF | | #### SPF |
| | | |
| SPF prevents spammers from sending unauthorized messages that app | | SPF prevents spammers from sending unauthorized messages that app |
| ear to be | | ear to be |
| from your domain. Set up SPF by publishing an SPF record at your | | from your domain. Set up SPF by publishing an SPF record at your |
| domain. The | | domain. The |
| SPF record for your domain should reference all email senders for | | SPF record for your domain should reference all email senders for |
| your domain. | | your domain. |
| If third-party senders aren't included in your SPF record, messag | | If third-party senders aren't included in your SPF record, messag |
| es from these | | es from these |
| senders are more likely to be marked as spam. Learn how to define | | senders are more likely to be marked as spam. Learn how to define |
| your SPF | | your SPF |
| record and add it to your domain. | | record and add it to your domain. |
| | | |
| #### DKIM | | #### DKIM |
| | | |
| Turn on DKIM for the domain that sends your email. Receiving serv | | Turn on DKIM for the domain that sends your email. Receiving serv |
| ers use DKIM | | ers use DKIM |
| to verify that the domain owner actually sent the message. Learn | | to verify that the domain owner actually sent the message. Learn |
| how to turn | | how to turn |
| on DKIM for your domain. | | on DKIM for your domain. |
| | | |
| **Important:** Sending to personal Gmail accounts requires a DKIM | | **Important:** Sending to personal Gmail accounts requires a DKIM |
| key of 1024 | | key of 1024 |
| bits or longer. For security reasons, we recommend using a 2048-b | | bits or longer. For security reasons, we recommend using a 2048-b |
| it key if | | it key if |
| your domain provider supports this. Learn more about DKIM key len | | your domain provider supports this. Learn more about DKIM key len |
| gth. | | gth. |
| | | |
| #### DMARC | | #### DMARC |
| | | |
| DMARC lets you tell receiving servers what to do with messages fr | | DMARC lets you tell receiving servers what to do with messages fr |
| om your | | om your |
| domain that don’t pass SPF or DKIM. Set up DMARC by publishing a | | domain that don’t pass SPF or DKIM. Set up DMARC by publishing a |
| DMARC record | | DMARC record |
| for your domain. To pass DMARC authentication, messages must be a | | for your domain. To pass DMARC authentication, messages must be a |
| uthenticated | | uthenticated |
| by SPF and/or DKIM. The authenticating domain must be the same do | | by SPF and/or DKIM. The authenticating domain must be the same do |
| main that's | | main that's |
| in the message From: header. Learn how to add a DMARC record at y | | in the message From: header. Learn how to add a DMARC record at y |
| our domain. | | our domain. |
| | | |
| We recommend you set up DMARC reports so you can monitor email se | | We recommend you set up DMARC reports so you can monitor email se |
| nt from your | | nt from your |
| domain, or appears to have been sent from your domain. DMARC repo | | domain, or appears to have been sent from your domain. DMARC repo |
| rts help you | | rts help you |
| identify senders that may be impersonating your domain. Learn mor | | identify senders that may be impersonating your domain. Learn mor |
| e about DMARC | | e about DMARC |
| reports. | | reports. |
| | | |
| When you set up DMARC, you can then optionally set up BIMI to add | | When you set up DMARC, you can then optionally set up BIMI to add |
| your brand | | your brand |
| logo to messages sent from your domain. Learn how to add your bra | | logo to messages sent from your domain. Learn how to add your bra |
| nd logo with | | nd logo with |
| BIMI. | | BIMI. |
| | | |
| #### ARC | | #### ARC |
| | | |
| ARC checks the previous authentication status of forwarded messag | | ARC checks the previous authentication status of forwarded messag |
| es. If a | | es. If a |
| forwarded message passes SPF or DKIM authentication, but ARC show | | forwarded message passes SPF or DKIM authentication, but ARC show |
| s it | | s it |
| previously failed authentication, Gmail treats the message as una | | previously failed authentication, Gmail treats the message as una |
| uthenticated. | | uthenticated. |
| | | |
| We recommend that senders use ARC authentication, especially if t | | We recommend that senders use ARC authentication, especially if t |
| hey forward | | hey forward |
| email regularly. Learn more about ARC authentication. | | email regularly. Learn more about ARC authentication. |
| | | |
| ### Infrastructure configuration | | ### Infrastructure configuration |
| | | |
| #### IP addresses | | #### IP addresses |
| | | |
| Your sending IP address must have a PTR record. PTR records verif | | Your sending IP address must have a PTR record. PTR records verif |
| y that the | | y that the |
| sending hostname is associated with the sending IP address. Every | | sending hostname is associated with the sending IP address. Every |
| IP address | | IP address |
| must map to a hostname in the PTR record. The hostname specified | | must map to a hostname in the PTR record. The hostname specified |
| in the PTR | | in the PTR |
| record must have a forward DNS that refers to the sending IP addr | | record must have a forward DNS that refers to the sending IP addr |
| ess. | | ess. |
| | | |
| Set up valid reverse DNS records of your sending server IP addres | | Set up valid reverse DNS records of your sending server IP addres |
| ses that | | ses that |
| point to your domain. Check for a PTR record with the Google Admi | | point to your domain. Check for a PTR record with the Google Admi |
| n Toolbox Dig | | n Toolbox Dig |
| tool. | | tool. |
| | | |
| **Important:** The sending IP address must match the IP address o | | **Important:** The sending IP address must match the IP address o |
| f the | | f the |
| hostname specified in the Pointer (PTR) record. | | hostname specified in the Pointer (PTR) record. |
| | | |
| #### Shared IP addresses | | #### Shared IP addresses |
| | | |
| A shared IP address ( _shared IP_ ) is an IP address used by more | | A shared IP address ( _shared IP_ ) is an IP address used by more |
| than one | | than one |
| email sender. The activity of any senders using a shared IP addre | | email sender. The activity of any senders using a shared IP addre |
| ss affects | | ss affects |
| the reputation of all senders for that shared IP. | | the reputation of all senders for that shared IP. |
| | | |
| A negative reputation can impact your delivery rate. | | A negative reputation can impact your delivery rate. |
| | | |
| If you use a shared IP for sending email: | | If you use a shared IP for sending email: |
| | | |
| * Make sure the shared IP address isn’t on any internet blockli | | * Make sure the shared IP address isn’t on any internet blockli |
| st. Messages sent from IP addresses on a blocklist are more likel | | st. Messages sent from IP addresses on a blocklist are more likel |
| y to be marked as spam. | | y to be marked as spam. |
| * If you use an email service provider for your shared IP, use | | * If you use an email service provider for your shared IP, use |
| Postmaster Tools to monitor the reputation of the shared IP addre | | Postmaster Tools to monitor the reputation of the shared IP addre |
| ss. | | ss. |
| | | |
| ### Subscriptions | | ### Subscriptions |
| | | |
| Only send email to people who want to get messages from you so th | | Only send email to people who want to get messages from you so th |
| ey’re less | | ey’re less |
| likely to report messages from your domain as spam. | | likely to report messages from your domain as spam. |
| | | |
| If messages from your domain are frequently reported as spam, fut | | If messages from your domain are frequently reported as spam, fut |
| ure messages | | ure messages |
| from you are more likely to be marked as spam. Over time, spam re | | from you are more likely to be marked as spam. Over time, spam re |
| ports can | | ports can |
| lower your domain’s reputation. You can monitor your domain’s rep | | lower your domain’s reputation. You can monitor your domain’s rep |
| utation with | | utation with |
| Postmaster Tools. | | Postmaster Tools. |
| | | |
| #### Make it easy to subscribe | | #### Make it easy to subscribe |
| | | |
| To help ensure your recipients are engaged: | | To help ensure your recipients are engaged: |
| | | |
| * Make sure recipients opt in to get messages from you. | | * Make sure recipients opt in to get messages from you. |
| * Confirm each recipient's email address before subscribing the | | * Confirm each recipient's email address before subscribing the |
| m. | | m. |
| * Periodically send messages to confirm that recipients want to | | * Periodically send messages to confirm that recipients want to |
| stay subscribed. | | stay subscribed. |
| * Consider unsubscribing recipients who don’t open or read your | | * Consider unsubscribing recipients who don’t open or read your |
| messages. | | messages. |
| | | |
| #### Make it easy to unsubscribe | | #### Make it easy to unsubscribe |
| | | |
| Always give your recipients an easy way to unsubscribe from your | | Always give your recipients an easy way to unsubscribe from your |
| messages. | | messages. |
| Letting people opt out of your messages can improve open rates, c | | Letting people opt out of your messages can improve open rates, c |
| lick-through | | lick-through |
| rates, and sending efficiency. One-click unsubscribe makes it eas | | rates, and sending efficiency. One-click unsubscribe makes it eas |
| y for people | | y for people |
| to opt out. If you send more than 5,000 message per day, your mar | | to opt out. If you send more than 5,000 message per day, your mar |
| keting and | | keting and |
| subscribed messages must support one-click unsubscribe. | | subscribed messages must support one-click unsubscribe. |
| | | |
| To set up one-click unsubscribe, include both of these headers in | | To set up one-click unsubscribe, include both of these headers in |
| outgoing | | outgoing |
| messages: | | messages: |
| | | |
| * List-Unsubscribe-Post: `List-Unsubscribe=One-Click` | | * List-Unsubscribe-Post: `List-Unsubscribe=One-Click` |
| * List-Unsubscribe: `<https://solarmora.com/unsubscribe/example | | * List-Unsubscribe: `<https://solarmora.com/unsubscribe/example |
| >` | | >` |
| | | |
| When a recipient unsubscribes using one-click, you receive this P | | When a recipient unsubscribes using one-click, you receive this P |
| OST request: | | OST request: |
| | | |
| `"POST /unsubscribe/example HTTP/1.1 | | `"POST /unsubscribe/example HTTP/1.1 |
| Host: solarmora.com | | Host: solarmora.com |
| Content-Type: application/x-www-form-urlencoded | | Content-Type: application/x-www-form-urlencoded |
| Content-Length: 26 | | Content-Length: 26 |
| List-Unsubscribe=One-Click"` | | List-Unsubscribe=One-Click"` |
| | | |
| Learn more about List-Unsubscribe: headers in RFC 2369 and RFC 80 | | Learn more about List-Unsubscribe: headers in RFC 2369 and RFC 80 |
| 58. | | 58. |
| | | |
| More unsubscribe methods we recommend: | | More unsubscribe methods we recommend: |
| | | |
| * Let recipients review the individual mailing lists they’re su | | * Let recipients review the individual mailing lists they’re su |
| bscribed to. Let them unsubscribe from lists individually, or all | | bscribed to. Let them unsubscribe from lists individually, or all |
| lists at once. | | lists at once. |
| * Automatically unsubscribe recipients who have multiple bounce | | * Automatically unsubscribe recipients who have multiple bounce |
| d messages. | | d messages. |
| | | |
| ### Message formatting | | ### Message formatting |
| | | |
| Follow these message formatting guidelines to increase the likeli | | Follow these message formatting guidelines to increase the likeli |
| hood that | | hood that |
| Gmail delivers your messages to the inbox instead of the spam fol | | Gmail delivers your messages to the inbox instead of the spam fol |
| der: | | der: |
| | | |
| * Format messages according to the Internet Format Standard (RF | | * Format messages according to the Internet Format Standard (RF |
| C 5322). | | C 5322). |
| * If your messages are in HTML, format them according to HTML s | | * If your messages are in HTML, format them according to HTML s |
| tandards. | | tandards. |
| * Don’t use HTML and CSS to hide content in your messages. Hidi | | * Don’t use HTML and CSS to hide content in your messages. Hidi |
| ng content might cause messages to be marked as spam. | | ng content might cause messages to be marked as spam. |
| * Message From: headers should include only one email address. | | * Message From: headers should include only one email address. |
| For example: | | For example: |
| `From: notifications@solarmora.com` | | `From: notifications@solarmora.com` |
| | | |
| * Make sure every message includes a valid Message-ID (RFC 5322 | | * Make sure every message includes a valid Message-ID (RFC 5322 |
| ). | | ). |
| * Make sure single-instance message headers are included only o | | * Make sure single-instance message headers are included only o |
| nce in a message. Examples of single-instance headers include Fro | | nce in a message. Examples of single-instance headers include Fro |
| m, To, Subject, and Date (RFC 5322). | | m, To, Subject, and Date (RFC 5322). |
| * Avoid excessively large message headers. To learn more, visit | | * Avoid excessively large message headers. To learn more, visit |
| Gmail message header limits. | | Gmail message header limits. |
| * Web links in the message body should be visible and easy to u | | * Web links in the message body should be visible and easy to u |
| nderstand. Recipients should know what to expect when they click | | nderstand. Recipients should know what to expect when they click |
| a link. | | a link. |
| * Sender information should be clear and visible. | | * Sender information should be clear and visible. |
| * Message subjects should be accurate and not misleading. | | * Message subjects should be accurate and not misleading. |
| * Format these international domains according to the Highly Re | | * Format these international domains according to the Highly Re |
| strictive guidelines in section 5.2 of Unicode Technical Standard | | strictive guidelines in section 5.2 of Unicode Technical Standard |
| #39: | | #39: |
| * Authenticating domain | | * Authenticating domain |
| * Envelope from domain | | * Envelope from domain |
| * Payload domain | | * Payload domain |
| * Reply-to domain | | * Reply-to domain |
| * Sender domain | | * Sender domain |
| | | |
| ## Sending guidelines | | ## Sending guidelines |
| | | |
| To reduce the chances that messages from your domain are sent to | | To reduce the chances that messages from your domain are sent to |
| spam or | | spam or |
| blocked by Gmail, follow these general best practices: | | blocked by Gmail, follow these general best practices: |
| | | |
| #### Recommended sending practices | | #### Recommended sending practices |
| | | |
| * Authenticate email with SPF and DKIM that are aligned. If you | | * Authenticate email with SPF and DKIM that are aligned. If you |
| use an email provider, verify that your provider supports this. | | use an email provider, verify that your provider supports this. |
| * Ideally, send all messages from the same IP address. If you m | | * Ideally, send all messages from the same IP address. If you m |
| ust send from multiple IP addresses, use a different IP address f | | ust send from multiple IP addresses, use a different IP address f |
| or each type of message. For example, use one IP address for send | | or each type of message. For example, use one IP address for send |
| ing account notifications and a different IP address for sending | | ing account notifications and a different IP address for sending |
| promotional messages. | | promotional messages. |
| * Messages of the same category should have the same From: emai | | * Messages of the same category should have the same From: emai |
| l address. For example, messages from a domain called `solarmora. | | l address. For example, messages from a domain called `solarmora. |
| com` might have From: addresses like: | | com` might have From: addresses like: |
| * Sales receipt messages: `sales@solarmora.com` | | * Sales receipt messages: `sales@solarmora.com` |
| * Promotional messages: `deals@solarmora.com` | | * Promotional messages: `deals@solarmora.com` |
| * Account notification messages: `alert@solarmora.com` | | * Account notification messages: `alert@solarmora.com` |
| * Messages sent from an address in the recipient’s contacts are | | * Messages sent from an address in the recipient’s contacts are |
| less likely to be marked as spam. | | less likely to be marked as spam. |
| | | |
| #### Sending practices to avoid | | #### Sending practices to avoid |
| | | |
| * Don't mix different types of content in the same message. For | | * Don't mix different types of content in the same message. For |
| example, don't include promotions in sales receipt messages. | | example, don't include promotions in sales receipt messages. |
| * Don't impersonate other domains or senders without permission | | * Don't impersonate other domains or senders without permission |
| . This practice is called _spoofing_ , and Gmail may mark these m | | . This practice is called _spoofing_ , and Gmail may mark these m |
| essages as spam. | | essages as spam. |
| * Don't mark internal messages as spam. This can negatively aff | | * Don't mark internal messages as spam. This can negatively aff |
| ect your domain's reputation, and future messages might be marked | | ect your domain's reputation, and future messages might be marked |
| as spam. | | as spam. |
| * Don't purchase email addresses from other companies. | | * Don't purchase email addresses from other companies. |
| * Don't send messages to people who didn't sign up to get messa | | * Don't send messages to people who didn't sign up to get messa |
| ges from you. These recipients might mark your messages as spam, | | ges from you. These recipients might mark your messages as spam, |
| and future messages to these recipients will be marked as spam. | | and future messages to these recipients will be marked as spam. |
| * Avoid opt-in forms that are checked by default and that autom | | * Avoid opt-in forms that are checked by default and that autom |
| atically subscribe users. Some countries and regions restrict aut | | atically subscribe users. Some countries and regions restrict aut |
| omatic opt-in. Before you opt-in users automatically, check the l | | omatic opt-in. Before you opt-in users automatically, check the l |
| aws in your region. | | aws in your region. |
| | | |
| Some legitimate messages may be marked as spam. Recipients can ma | | Some legitimate messages may be marked as spam. Recipients can ma |
| rk valid | | rk valid |
| messages as not spam, so future messages from the sender should b | | messages as not spam, so future messages from the sender should b |
| e delivered | | e delivered |
| to their inbox. | | to their inbox. |
| | | |
| ### Increase sending volume slowly | | ### Increase sending volume slowly |
| | | |
| When increasing sending volume, keep in mind: | | When increasing sending volume, keep in mind: |
| | | |
| * Increasing the sending volume too quickly can result in deliv | | * Increasing the sending volume too quickly can result in deliv |
| ery problems. As you gradually increase your sending mail volume, | | ery problems. As you gradually increase your sending mail volume, |
| use Postmaster Tools to monitor mail performance. | | use Postmaster Tools to monitor mail performance. |
| * For work and school accounts, sending limits apply even when | | * For work and school accounts, sending limits apply even when |
| recipients are in different Google Workspace domains. For example | | recipients are in different Google Workspace domains. For example |
| , you might send email to users with email addresses that have th | | , you might send email to users with email addresses that have th |
| e domains `your-company.net` and `solarmora.com` _. _Although th | | e domains `your-company.net` and `solarmora.com` _. _Although th |
| e domains are different, if both domains have `google.com` as the | | e domains are different, if both domains have `google.com` as the |
| ir MX record, messages sent to these domains count toward your li | | ir MX record, messages sent to these domains count toward your li |
| mit. | | mit. |
| * If you use Google Workspace or Gmail for sending: When you re | | * If you use Google Workspace or Gmail for sending: When you re |
| ach the sending limit, Google Workspace limits the message sendin | | ach the sending limit, Google Workspace limits the message sendin |
| g rate for the sending IP address. | | g rate for the sending IP address. |
| | | |
| If you send large amounts of email, we recommend you: | | If you send large amounts of email, we recommend you: |
| | | |
| * Send email at a consistent rate. Avoid sending email in burst | | * Send email at a consistent rate. Avoid sending email in burst |
| s. | | s. |
| * Start with a low sending volume to engaged users, and slowly | | * Start with a low sending volume to engaged users, and slowly |
| increase the volume over time. | | increase the volume over time. |
| * As you increase the sending volume, regularly monitor server | | * As you increase the sending volume, regularly monitor server |
| responses, the spam rate, and the sending domain's reputation. Re | | responses, the spam rate, and the sending domain's reputation. Re |
| gular monitoring will allow you to quickly adapt if your sending | | gular monitoring will allow you to quickly adapt if your sending |
| is rate limited, if the spam rate is increased, or when the sendi | | is rate limited, if the spam rate is increased, or when the sendi |
| ng domain's reputation drops. | | ng domain's reputation drops. |
| * Avoid introducing sudden volume spikes if you do not have a h | | * Avoid introducing sudden volume spikes if you do not have a h |
| istory of sending large volumes. For example, immediately doublin | | istory of sending large volumes. For example, immediately doublin |
| g previously sent volumes suddenly could result in rate limiting | | g previously sent volumes suddenly could result in rate limiting |
| or reputation drops. | | or reputation drops. |
| * If you change the format of bulk emails, increase the traffic | | * If you change the format of bulk emails, increase the traffic |
| segment with the new format gradually. | | segment with the new format gradually. |
| * When making significant changes to sending infrastructure or | | * When making significant changes to sending infrastructure or |
| email or email header structure, increase the modified segment of | | email or email header structure, increase the modified segment of |
| traffic separately. | | traffic separately. |
| * If messages start bouncing or start being deferred, reduce th | | * If messages start bouncing or start being deferred, reduce th |
| e sending volume until the SMTP error rate decreases. Then, incre | | e sending volume until the SMTP error rate decreases. Then, incre |
| ase slowly again. If bounces and deferrals continue at a low volu | | ase slowly again. If bounces and deferrals continue at a low volu |
| me, review individual messages to identify problems. For example, | | me, review individual messages to identify problems. For example, |
| you can try sending a blank test message and see if it experienc | | you can try sending a blank test message and see if it experienc |
| es issues. | | es issues. |
| * Stay within the IP limits for sending: | | * Stay within the IP limits for sending: |
| * Be aware of email sending limits when sending from domains | | * Be aware of email sending limits when sending from domains |
| that have a Google.com MX host. | | that have a Google.com MX host. |
| * Limit sending email from a single IP address based on the M | | * Limit sending email from a single IP address based on the M |
| X record domain, not the domain in the recipient email address. | | X record domain, not the domain in the recipient email address. |
| * Monitor responses so you can change sending rates as needed | | * Monitor responses so you can change sending rates as needed |
| to stay within these limits. | | to stay within these limits. |
| | | |
| These factors affect how quickly you can increase sending volume: | | These factors affect how quickly you can increase sending volume: |
| | | |
| * Amount of email sent: The more email that you send, the more | | * Amount of email sent: The more email that you send, the more |
| slowly you should increase sending volume. | | slowly you should increase sending volume. |
| * Frequency of sending email: You can increase the sending volu | | * Frequency of sending email: You can increase the sending volu |
| me more quickly when you send daily instead of weekly. | | me more quickly when you send daily instead of weekly. |
| * Recipient feedback about your messages: Make sure you send on | | * Recipient feedback about your messages: Make sure you send on |
| ly to people who subscribe to your emails, and give recipients an | | ly to people who subscribe to your emails, and give recipients an |
| option to unsubscribe. | | option to unsubscribe. |
| | | |
| In the event of a recent spike in email activity, adhering to bes | | In the event of a recent spike in email activity, adhering to bes |
| t practices | | t practices |
| outlined above will likely resolve any deliverability issues auto | | outlined above will likely resolve any deliverability issues auto |
| matically | | matically |
| during subsequent sends. | | during subsequent sends. |
| | | |
| ## Special considerations | | ## Special considerations |
| | | |
| ### Using email service providers | | ### Using email service providers |
| | | |
| Google and Gmail don’t accept allowlist requests from email provi | | Google and Gmail don’t accept allowlist requests from email provi |
| ders. We | | ders. We |
| can't guarantee messages sent by email providers will pass Gmail’ | | can't guarantee messages sent by email providers will pass Gmail’ |
| s spam | | s spam |
| filters. | | filters. |
| | | |
| If you use a third-party email provider to send email for your do | | If you use a third-party email provider to send email for your do |
| main: | | main: |
| | | |
| * Verify that the provider follows the guidelines in this artic | | * Verify that the provider follows the guidelines in this artic |
| le. Large providers, such as Google, AOL, and Yahoo, typically fo | | le. Large providers, such as Google, AOL, and Yahoo, typically fo |
| llow these guidelines. | | llow these guidelines. |
| * Make sure the SPF record for your domain includes references | | * Make sure the SPF record for your domain includes references |
| to all email senders for your domain. If third-party senders aren | | to all email senders for your domain. If third-party senders aren |
| 't included in your SPF record, messages sent from these provider | | 't included in your SPF record, messages sent from these provider |
| s are more likely to be marked as spam. Learn how to set up your | | s are more likely to be marked as spam. Learn how to set up your |
| SPF record. | | SPF record. |
| | | |
| If you use a domain provider but you manage your own email, we re | | If you use a domain provider but you manage your own email, we re |
| commend you: | | commend you: |
| | | |
| * Review and follow the best practices in this article for send | | * Review and follow the best practices in this article for send |
| ing email to Gmail accounts. | | ing email to Gmail accounts. |
| * Use Postmaster Tools to monitor information about messages se | | * Use Postmaster Tools to monitor information about messages se |
| nt from your domain to Gmail accounts. | | nt from your domain to Gmail accounts. |
| | | |
| #### **Third-party email providers** | | #### **Third-party email providers** |
| | | |
| When clients use your service to send email, you’re responsible f | | When clients use your service to send email, you’re responsible f |
| or their | | or their |
| sending practices. We recommend taking these steps to help manage | | sending practices. We recommend taking these steps to help manage |
| your | | your |
| clients’ sending activity: | | clients’ sending activity: |
| | | |
| * Offer an email address for reporting email abuse, for example | | * Offer an email address for reporting email abuse, for example |
| : `abuse@mail-provider.com`. | | : `abuse@mail-provider.com`. |
| * Make sure your contact information in your WHOIS record and o | | * Make sure your contact information in your WHOIS record and o |
| n `abuse.net` are current. | | n `abuse.net` are current. |
| * Immediately remove any client who uses your service to send s | | * Immediately remove any client who uses your service to send s |
| pam. | | pam. |
| | | |
| ### Affiliate marketing | | ### Affiliate marketing |
| | | |
| Affiliate marketing programs offer rewards to companies or indivi | | Affiliate marketing programs offer rewards to companies or indivi |
| duals that | | duals that |
| send visitors to your website. However, spammers can abuse these | | send visitors to your website. However, spammers can abuse these |
| programs. If | | programs. If |
| your brand is associated with marketing spam, other messages sent | | your brand is associated with marketing spam, other messages sent |
| by you might | | by you might |
| be marked as spam. | | be marked as spam. |
| | | |
| We recommend you regularly monitor affiliates, and remove any aff | | We recommend you regularly monitor affiliates, and remove any aff |
| iliates that | | iliates that |
| send spam. | | send spam. |
| | | |
| ### Phishing exercises | | ### Phishing exercises |
| | | |
| Don’t send test phishing messages or test campaigns from your dom | | Don’t send test phishing messages or test campaigns from your dom |
| ain. Your | | ain. Your |
| domain’s reputation might be negatively affected, and your domain | | domain’s reputation might be negatively affected, and your domain |
| could be | | could be |
| added to internet blocklists. | | added to internet blocklists. |
| | | |
| ## Monitoring and troubleshooting | | ## Monitoring and troubleshooting |
| | | |
| ### Postmaster Tools | | ### Postmaster Tools |
| | | |
| Use Postmaster Tools to get information about the email you send | | Use Postmaster Tools to get information about the email you send |
| to Gmail | | to Gmail |
| users, for example: | | users, for example: |
| | | |
| * When recipients mark your messages as spam. | | * When recipients mark your messages as spam. |
| * Why your messages might not be delivered. | | * Why your messages might not be delivered. |
| * If your messages are authenticated. | | * If your messages are authenticated. |
| * Your domain or IP reputation and its impact on message delive | | * Your domain or IP reputation and its impact on message delive |
| ry rates. | | ry rates. |
| | | |
| **Spam rate** | | **Spam rate** |
| | | |
| * Regularly monitor your domain's spam rate in Postmaster Tools | | * Regularly monitor your domain's spam rate in Postmaster Tools |
| . | | . |
| * Keep spam rates reported in Postmaster Tools below 0.10% and | | * Keep spam rates reported in Postmaster Tools below 0.10% and |
| avoid ever reaching a spam rate of 0.30% or higher. Learn more | | avoid ever reaching a spam rate of 0.30% or higher. Learn more |
| * Maintaining a low spam rate makes senders more resilient to o | | * Maintaining a low spam rate makes senders more resilient to o |
| ccasional spikes in user feedback. | | ccasional spikes in user feedback. |
| * Similarly, maintaining a high spam rate will lead to increase | | * Similarly, maintaining a high spam rate will lead to increase |
| d spam classification. It can take time for improvements in spam | | d spam classification. It can take time for improvements in spam |
| rate to reflect positively on spam classification. | | rate to reflect positively on spam classification. |
| | | |
| **Open rate** | | **Open rate** |
| | | |
| * Google does not explicitly track open rates. | | * Google does not explicitly track open rates. |
| * Google isn’t able to verify the accuracy of open rates report | | * Google isn’t able to verify the accuracy of open rates report |
| ed by third parties. | | ed by third parties. |
| * Low open rates may not be an accurate indicator of deliverabi | | * Low open rates may not be an accurate indicator of deliverabi |
| lity or spam classification issues. | | lity or spam classification issues. |
| | | |
| ### Troubleshooting | | ### Troubleshooting |
| | | |
| #### Warning banners | | #### Warning banners |
| | | |
| * Check regularly that your domain isn’t listed as unsafe with | | * Check regularly that your domain isn’t listed as unsafe with |
| Google Safe Browsing. | | Google Safe Browsing. |
| * To check your domain status, enter your domain in the Safe Br | | * To check your domain status, enter your domain in the Safe Br |
| owsing site status page. | | owsing site status page. |
| * Check any other domains that are linked to yours. | | * Check any other domains that are linked to yours. |
| | | |
| #### Delivery issues when sending through email service providers | | #### Delivery issues when sending through email service providers |
| | | |
| If you’re having delivery issues with email sent by a service pro | | If you’re having delivery issues with email sent by a service pro |
| vider, verify | | vider, verify |
| that they use the recommended practices in this article. | | that they use the recommended practices in this article. |
| | | |
| #### Use the Google Admin Toolbox to review domain settings | | #### Use the Google Admin Toolbox to review domain settings |
| | | |
| Use the Google Admin Toolbox to check and fix settings for your d | | Use the Google Admin Toolbox to check and fix settings for your d |
| omain. | | omain. |
| | | |
| #### Fix the source of rejected email | | #### Fix the source of rejected email |
| | | |
| If your messages are rejected, you might get an error message. Le | | If your messages are rejected, you might get an error message. Le |
| arn more | | arn more |
| about the error so you can fix the problem. Common error messages | | about the error so you can fix the problem. Common error messages |
| are: | | are: |
| | | |
| * **421, "4.7.0":** **** Messages are rejected because the send | | * **421, "4.7.0":** **** Messages are rejected because the send |
| ing server’s IP address is not on the allowed list for the recipi | | ing server’s IP address is not on the allowed list for the recipi |
| ent’s domain. | | ent’s domain. |
| * **550, "5.7.1":** Messages are rejected because the sending s | | * **550, "5.7.1":** Messages are rejected because the sending s |
| erver’s IP address is on an IP suspended list. You might get this | | erver’s IP address is on an IP suspended list. You might get this |
| error if you’re sending mail using a shared IP with a poor reput | | error if you’re sending mail using a shared IP with a poor reput |
| ation. | | ation. |
| | | |
| Learn more about email and SMTP error messages: | | Learn more about email and SMTP error messages: |
| | | |
| * SMTP error reference | | * SMTP error reference |
| * Fix bounced or rejected emails | | * Fix bounced or rejected emails |
| | | |
| #### Fix IPv6 authorization errors | | #### Fix IPv6 authorization errors |
| | | |
| An IPv6 authorization error could mean that the PTR record for th | | An IPv6 authorization error could mean that the PTR record for th |
| e sending | | e sending |
| server isn’t using IPv6. If you use an email service provider, co | | server isn’t using IPv6. If you use an email service provider, co |
| nfirm they’re | | nfirm they’re |
| using an IPv6 PTR record. | | using an IPv6 PTR record. |
| | | |
| Here's an example of an IPv6 authorization error: | | Here's an example of an IPv6 authorization error: |
| | | |
| **550-5.7.1:** Message does not meet IPv6 sending guidelines rega | | **550-5.7.1:** Message does not meet IPv6 sending guidelines rega |
| rding PTR | | rding PTR |
| records and authentication. | | records and authentication. |
| | | |
| #### Use the troubleshooting tool | | #### Use the troubleshooting tool |
| | | |
| If you’re still having mail delivery problems after following the | | If you’re still having mail delivery problems after following the |
| guidelines | | guidelines |
| in this article, try Troubleshooting for senders with email deliv | | in this article, try Troubleshooting for senders with email deliv |
| ery issues. | | ery issues. |
| | | |
| Translations of our policies are provided for your convenience. I | | Translations of our policies are provided for your convenience. I |
| f there is a | | f there is a |
| conflict between the text of this policy and the text of the Engl | | conflict between the text of this policy and the text of the Engl |
| ish language | | ish language |
| version of the policy, the text of the English language version o | | version of the policy, the text of the English language version o |
| f the policy | | f the policy |
| takes precedence. | | takes precedence. |
| | | |
| ## Related topics | | ## Related topics |
| | | |
| * Email sender guidelines FAQ | | * Email sender guidelines FAQ |
| * Fixed bounced emails | | * Fixed bounced emails |
| * Fix messages rejected by Google Groups | | * Fix messages rejected by Google Groups |
| | | |
n | | n | ## Was this helpful? |
| | | |
| | | How can we improve it? |
| | | |
| | | YesNo |
| | | |
| | | Submit |
| | | |
| ## Need more help? | | ## Need more help? |
| | | |
| ### Try these next steps: | | ### Try these next steps: |
| | | |
| Post to the help community Get answers from community members | | Post to the help community Get answers from community members |
| | | |
n | true | n | Contact us Tell us more and we’ll help you get there |
| | | |
n | ## Bulk email sending guidelines & tools | n | true |
| | | |
n | | n | ## Problems with sending |
| | | |
| * 1 of 4 | | * 1 of 10 |
| | | |
| | | Fix bounced or rejected emails |
| | | |
| | | * 2 of 10 |
| | | |
| | | Fix email bounces due to blocked IP address |
| | | |
| | | * 3 of 10 |
| | | |
| | | Messages from a bulk sender bounce |
| | | |
| | | * 4 of 10 |
| | | |
| | | Message bounced due to a policy rule |
| | | |
| | | * 5 of 10 |
| | | |
| | | Email bounces with error message |
| | | |
| | | * 6 of 10 |
| | | |
| | | Avoid email bouncing from new MX records |
| | | |
| | | * 7 of 10 |
| | | |
| | | Best practices for forwarding email to Gmail |
| | | |
| | | * 8 of 10 |
| | | |
| | | Some recipients don't get my email |
| | | |
| | | * 9 of 10 |
| | | |
| | | SMTP relay spam policy in Gmail |
| | | |
| | | * 10 of 10 |
| | | |
| Email sender guidelines | | Email sender guidelines |
| | | |
n | * 2 of 4 | n | ![](https://lh3.googleusercontent.com/exxMjxadqER4Ie3_TMeBqZfSwNB |
| | | fL_3tU0Xvn4tJ3_POtw4haXNbIx7OL7v52_DcaBpe=w96) |
| | | |
n | Email sender guidelines FAQ | n | Start your free 14-day trial today |
| | | |
n | * 3 of 4 | n | Professional email, online storage, shared calendars, video meeti |
| | | ngs and more. |
| | | Start your free Google Workspace trial today. |
| Feedback Loop | | |
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| * 4 of 4 | | |
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| Postmaster Tools | | |
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| * ©2024 Google | | * ©2024 Google |
| * Privacy Policy | | * Privacy Policy |
| * Terms of Service | | * Terms of Service |
n | * Program Policies | n | |
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