Hello,
we use to send a portion of messages requesting delivery status
notification on success.
In general DSN messages tend to not pass DMARC very often, but as we
request DSN on success explicit
we monitor them.
Now I noticed a pattern on DSN sent from Microsoft.
RFC5321.MailFrom <>
RFC5322.From <postmaster@${customer}.emea.microsoftonline.com>
DKIM-Signature d=${customer}.onmicrosoft.com
SPF could never be aligned and DKIM isn't aligned.
$ opendmarc-check microsoftonline.com
DMARC record for microsoftonline.com:
Sample percentage: 100
DKIM alignment: relaxed
SPF alignment: relaxed
Domain policy: none
Subdomain policy: quarantine
Aggregate report URIs:
mailto:[email protected]
Failure report URIs:
mailto:[email protected]
Any subdomain use p=quarantine but any DSN systematically fail.
Is this intentional?
Andreas
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