On 18.03.22 12:35, Jesper Dybdal wrote:
I run postfix  3.4.14 (Debian Buster) with Amavisd-new as a pre-queue filter.

I would now like to add DMARC validation, done by the opendmarc milter in the after-Amavis smtpd instance.

This basically works: opendmarc inserts an "Authentication-Results" header.

I would now like to do something (e.g., reject) depending on that header.

opendmarc can reject itself, if you configure it to. However, opendmarc milter requires those Authentication-Results headers for SPF and DKIM to be already present. so you need spf/dkim milter(s) before opendmarc.

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