Starting February 1, 2024, all email senders who send email to Gmail accounts must meet the requirements in this section.
- Set up SPF or DKIM email authentication for your sending domains.
- Ensure that sending domains or IPs have valid forward and reverse DNS records, also referred to as PTR records.
- Use a TLS connection for transmitting email. For steps to set up TLS in Google Workspace, visit Require a secure connection for email.
- Keep spam rates reported in Postmaster Tools below 0.3%. Learn more about spam rates
- Format messages according to the Internet Message Format standard, RFC 5322.
- Don’t impersonate Gmail From: headers. Gmail will begin using a DMARC quarantine enforcement policy, and impersonating Gmail From: headers might impact your email delivery.
- If you manage a forwarding service, including mailing lists or inbound gateways, add ARC headers to outgoing email. ARC headers indicate the message was forwarded and identify you as the forwarder. Mailing list senders should also add a List-id: header, which specifies the mailing list, to outgoing messages.
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From https://support.google.com/a/answer/14229414#zippy=%2Cwhat-i...
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Starting February 1, 2024, all email senders who send email to Gmail accounts must meet the requirements in this section.
- Set up SPF or DKIM email authentication for your sending domains.
- Ensure that sending domains or IPs have valid forward and reverse DNS records, also referred to as PTR records.
- Use a TLS connection for transmitting email. For steps to set up TLS in Google Workspace, visit Require a secure connection for email.
- Keep spam rates reported in Postmaster Tools below 0.3%. Learn more about spam rates
- Format messages according to the Internet Message Format standard, RFC 5322.
- Don’t impersonate Gmail From: headers. Gmail will begin using a DMARC quarantine enforcement policy, and impersonating Gmail From: headers might impact your email delivery.
- If you manage a forwarding service, including mailing lists or inbound gateways, add ARC headers to outgoing email. ARC headers indicate the message was forwarded and identify you as the forwarder. Mailing list senders should also add a List-id: header, which specifies the mailing list, to outgoing messages.