Bounces are sent with the null envelope.from address which has no
domain. Therefore, SPF applies policy to a surrogate: the hostname
in the SMTP client's HELO/EHLO command (as if the envelope.from
address was postmaster@helo-argument).
This helo-argument is by default the value of the Postfix myhostname
parameter, which depending on myorigin setting may appear in the
header.from address mailer-daemon@whatever.
DMARC wants that the dmain in envelope.from address (or its surrogate
in the case of <>) in some way align with the domain in the header.from
address (in this case mailer-daemon@whatever).
If someone can come up with a simple checklist for how to do this
then that would be great.
Wietse
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