OpenDMARC sends mail from my server


Browsing the log files on my MIAB server, I saw rejected replies from, and looked into it.

The box has sent a few mails like these:

Feb  8 17:32:30 mail postfix/pickup[27848]: 039268712C: uid=120 from=<opendmarc>
Feb  8 17:32:30 mail postfix/cleanup[1656]: 039268712C: message-id=<20220208163230.039268712C@mail.server>
Feb  8 17:32:30 mail postfix/qmgr[19694]: 039268712C: from=<opendmarc@mail.server>, size=9381, nrcpt=1 (queue active)
Feb  8 17:32:34 mail postfix/smtp[1665]: 039268712C: to=<>,[]:25, delay=4.3, delays=0.08/0.03/0.52/3.7, dsn=2.0.0, status=sent (250 2.0.0 Ok: queued as B9A746480)
Feb  8 17:32:34 mail postfix/qmgr[19694]: 039268712C: removed

There’s a reply too which is being rejected:

Feb  9 18:10:53 mail postfix/smtpd[5756]: NOQUEUE: reject: RCPT from[]: 550 5.1.1 <opendmarc@mail.server>: Recipient address rejected: User unknown in virtual mailbox table; from=<> to=<opendmarc@mail.server> proto=ESMTP helo=<>

What’s going on here?

MiaB automatically sends emails to domains that have DMARC records configured for notification:

dig +short txt
"v=DMARC1; p=none; pct=100;!5m;!5m"


I’ve setup an alias for the sender address so I can see what they’re replying :slight_smile:

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