Greylisting flexibility for dynamic sender IP addresses
This came up in the thread "Greylisting -- requesting enhancements" but I don't see a feature request for it:
What's needed is a way to deal with a sender who uses a different IP address for each attempt, and as a result, never matches an existing triplet, and therefore is repeatedly delayed.
This came up on my server with an email from aa.com (American Airlines) that was rejected more than a dozen times from different IP addresses and never was accepted.
I'm not sure of the best approach to fixing this, but it could help to have more flexibility in matching the sender IP address in the triplet.