natan via Postfix-users:
> Hi
> The logs show that Postfix does not pass the from key because the From
> header comes from the message body, and Postfix by default only supports
> sender information from the Envelope From (sender). Right?
check_policy_service is an envelope feature. To enforce
policy on head and envelope, use milter-regex.
> I'm trying to write something "like DMARC" in Python to reject if the
> From and return-path for the selected domain are different
> only that much and as much as that......
> I cannot find other user-friendly solutions
Why not use use DMARC tools to enforce DMARC policy?
Whether milter-regex is user-friendly depends on the user.
Untested example:
reject envelope from example.com does not match header from
envfrom /@example\.com$/i and not header /From/ /@example\.com\b/ei
This uses the following flags:
i to make matches case-insensitive
e to match a word boundary with \b
The header from matching can be improved if the address is always
inside < and >.
Wietse
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