Hi,
I sometimes get this response:
421-4.7.30 This mail has been rate limited because DKIM does not pass. Gmail
421-4.7.30 requires all large senders to authenticate with DKIM.
421-4.7.30
421-4.7.30 Authentication results:
421-4.7.30 DKIM = did not pass
421-4.7.30 For instructions on setting up DKIM authentication, go to
421-4.7.30 https://support.google.com/a/answer/180504
421-4.7.30 To learn more about Gmail's sender policy, go to
421 4.7.30 https://support.google.com/mail/answer/81126. (token) - gsmtp
It was a forwarded message, so it might happen something went wrong, albeit I
try and avoid applying changes on forwarded messages. (Besides, I'm no large
sender.)
Since I implemented ARC, I don't add a DKIM signature to forwarded messages any
more, and apply an ARC set instead. Unfortunately, I get no feedback about
that, as ARC is missing a reporting part. I guess Google does verify ARC.
I know that any DKIM or ARC signature has no DMARC relevance on forwarded
messages, where d= doesn't match the From: domain. However, the above response
doesn't mention DMARC, so I wonder whether that message would have passed if I
had put DKIM instead or ARC.
The last URL in the response says something about ARC:
ARC checks the previous authentication status of forwarded messages.
If a forwarded message passes SPF or DKIM authentication, but ARC
shows it previously failed authentication, Gmail treats the message as
unauthenticated.
Isn't it overkill to put both DKIM /and/ ARC if you know the receiver
implements both?
Best
Ale
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