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= Email sender guidelines =

https://support.google.com/mail/answer/81126?hl=en

All senders の条件も満たす必要があると理解すべきだろう。-- ToshinoriMaeno <<DateTime(2023-12-07T19:22:15+0900)>>
   例えば、TLSを使う件。
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Sender guidelines

Follow these guidelines to help ensure messages are delivered to Gmail accounts as expected, and to help prevent Gmail from limiting sending rates, blocking messages, or marking messages as spam.

For more information about meeting these requirements, visit our Email sender guidelines FAQ.

Requirements for all senders
Requirements for sending 5,000 or more messages per day
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== Requirements ==
旧:
  *  Keep spam rates reported in Postmaster Tools below 0.10% and avoid ever reaching a spam rate of 0.30% or higher. 
      Learn more about spam rates.


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Requirements for sending 5,000 or more messages per day

Starting February 1, 2024, senders who send more than 5,000 messages per day 
to Gmail accounts must meet the requirements in this section.
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  *  Set up SPF and DKIM email authentication for your domain.
  *  Ensure that   
     sending domains or IPs have valid forward and reverse DNS records, also referred to as PTR records. Learn more
  *  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 0.30%.       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 regularly forward email, including using 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.
  *  Set up DMARC email authentication for your sending domain. Your DMARC enforcement policy can be set to none. Learn more
  *  For direct mail, the domain in the sender's From: header must be aligned with either the SPF domain or the DKIM domain. This is required to pass DMARC alignment.
  *  Marketing messages and subscribed messages must support one-click unsubscribe, and include a clearly visible unsubscribe link in the message body. Learn more
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If you send more than 5,000 emails per day before February 1, 2024, 
follow the guidelines in this article as soon as possible. 
Meeting the sender requirements before the deadline may improve your email delivery. 
If you don’t meet the requirements described in this article, your email might not be delivered as expected, 
or might be marked as spam. To get help with email delivery issues, go to Troubleshooting.
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== history ==
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