Hello,
It's never wrong to send all outbound messages through a content filter.
since some weeks I do this for my generated aggregated DMARC reports, too.
Surprise: some reports are blocked by my own filter!
That happen on reports for domains that are listed somewhere.
(Spamhaus DBL, mywot.com, ...)
Mostly for poor domain reputation.
Practical I not only invest resources to filter bad messages, I also
invest resources
to provide a special service to those bad domain owners. I exactly
would tell them
what's wrong on there messages and what's fine. I would help them to
optimise there
networks and delivery rate by sending DMARC reports.
No, I wouldn't!
Fortunately I didn't. My content filter blocked these reports.
Spammer use DMARC - no surprise.
Anybody made similar observation?
Ideas to mitigate?
Andreas
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