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4月からエラーにすると言っていた記述はなくなったらしい。
  一時エラーではなく、拒否を始めるように読める。-- ToshinoriMaeno <<DateTime(2024-03-08T15:01:14+0900)>>

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Sender guidelines enforcement

== What is the timeline for enforcement of sender guidelines? ==
{{{
Enforcement for bulk senders that don’t meet our Email sender guidelines will be gradual and progressive.
}}}
2月から:
Bulk senders who don’t meet our sender requirements will start getting temporary errors 
with error codes on a small portion of messages that don’t meet the requirements.

These temporary errors help senders identify email that doesn’t meet our guidelines so 
senders can resolve issues that prevent compliance. 

Email systems will typically attempt to retry sending messages that get temporary errors, after a short delay.

Senders are encouraged to check their email compliance status using Postmaster Tools.


== history ==

The table below describes the enforcement timeline and will be updated as needed:
{{{
Sender requirement 	                 Enforcement
                                         Temporary failures with error codes
SPF and DKIM authentication
Gmail From: header impersonation
From: header alignment
Valid forward and reverse DNS records
Messages formatted according RFC 5322
Messages sent using TLS
}}}
 
Enforcement for these requirements will begin no earlier than June 2024:
{{{
    DMARC authentication
    One-click unsubscribe in marketing messages
    Mitigations unavailable when user-reported spam rates exceed 0.3% or if the sender has not met the authentication or one-click unsubscribe requirements.
}}}

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