Hi Dexter,
For a sender doing a few thousand messages a month, with clean SPF and aligned DKIM and no known third-party senders, what triggers the step to quarantine and then reject? A fixed number of rua reports, a quiet period with no unexplained failures, a business requirement, or something else? And how much weight do you give the risk of an unseen legitimate flow breaking on the way?
The question is, whether you are using either amavis/spamassassin or rspamd. If its log is configured to dispaly the header-from (the postfix log doesn't) you can easily simulate what happens to incoming mail with your own domain, if you switch to p=quarantine or p=reject. Is this the case?
Best wishes, Rainer (Daeschler)
smime.p7s
Description: Kryptografische S/MIME-Signatur
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