Hi, I have a postfix-3.7.3 system on fedora37 and we're routing mail for a business using an Ironport device at their border. Instead of accepting all messages from us as their MX, there are some messages that it has determined are spam or otherwise undeliverable, which are resulting in them bouncing them back to us, where our system is then queuing them. These messages are undeliverable (this one was from mail.sqribblepro.shop), so it just sits in our queue, continually trying to be delivered unsuccessfully until we either remove it or it expires.
Aug 5 11:03:14 xavier postfix-out/smtp[224468]: 59291305F59C3: to=< nca...@example1.com>, relay=mx1.hc4719.iphmx.com[207.54.11.59]:25, delay=0.98, delays=0/0/0.8/0.18, dsn=5.0.0, status=bounced (host mx1.hc4719.iphmx.com[207.54.11.59] said: 550 #5.7.1 Your access to submit messages to this e-mail system has been rejected. (in reply to DATA command)) Aug 5 11:03:14 xavier postfix-out/cleanup[225801]: 55453305F59C9: message-id=<20230804150314.55453305f5...@xavier.example.com> Aug 5 11:03:14 xavier postfix-out/bounce[224445]: 59291305F59C3: sender non-delivery notification: 55453305F59C9 Aug 5 11:03:14 xavier postfix-out/qmgr[193207]: 55453305F59C9: from=<>, size=12276, nrcpt=1 (queue active) Aug 5 11:03:14 xavier postfix-out/qmgr[193207]: 59291305F59C3: removed We're only doing basic spam protection for them, and while this mail server may be on a blocklist now, it wasn't then. It's also not always spam that they reject, but otherwise legitimate messages that are blocked by policy. I also realize having them adjust their policy is probably the best solution, but that's not possible right now. How can I either immediately drop these messages or simply not allow them to refuse these messages? Thanks, Alex
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