> Contrary to someone else's experience related in this thread, I > still see a significant amount of spam that greylisting blocks, and > extremely few spammers retry and get through.
I concurn, as reported, I curently see greylisting reduce spam by a factor of 4. > I have only had one known case (i.e. someone said they were > expecting an email that they didn't receive) in a very long time > where a legitimate email was greylisted and the sending server did > not retry, and that was recently from an outlook365 server. Aliexpress is one perplexing offender I've had to deal with. The send badly formed messages, retry aggressively for a few seconds then never again so messages get lost. I've not been able to reach anyone there.
