It appears that Peter Nicolai Mathias Hansteen via mailop <pe...@bsdly.net> said: >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).
SMTP was defined in the late 1970s and we didn't invent greylisting until about 2003. I don't think you can blame them for not being clairvoyant. I find that fuzzing the IP addresses to anything in the same ipv4 /24 or ipv6 /64 handles most of the different IP retries without letting any more spam through. _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
