> 21. apr. 2021 kl. 12:23 skrev Neil Youngman via mailop <mailop@mailop.org>: >> > > It doesn't behave exactly like a normal mail server, but it does retry > more than five times. Not all retries are from the same IP, but I have > observed that retries from the same IP don't get delivered.
That may be the exact source of the problem. Greylisting implementations tend to expect retries to come from the same IP address as the original one. Some of us are still quite cross that the writers-of-RFCs did not care to make that a MUST requirement (see [1] for my grumble on that from a while back). If you can’t guarantee that, please consider letting the retries run for a reasonable amount of time, at least a few days. Some of us have bent over backwards to compensate for those failures by introducing mechanisms to whitelist hosts that appear in known sites’ SPF records and a few other tricks (see [2]]. [1] https://bsdly.blogspot.com/2008/10/ietf-failed-to-account-for-greylisting.html <https://bsdly.blogspot.com/2008/10/ietf-failed-to-account-for-greylisting.html> [2] https://bsdly.blogspot.com/2018/11/goodness-enumerated-by-robots-or.html <https://bsdly.blogspot.com/2018/11/goodness-enumerated-by-robots-or.html> All the best, Peter — Peter N. M. Hansteen, member of the first RFC 1149 implementation team http://bsdly.blogspot.com/ http://www.bsdly.net/ http://www.nuug.no/ "Remember to set the evil bit on all malicious network traffic" delilah spamd[29949]: 85.152.224.147: disconnected after 42673 seconds.
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