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I'm using something very similar, except incoming messages from never-seen-before senders are greylisted instead: https://en.wikipedia.org/wiki/Greylisting_(em
by kees99 2y ago
I'm using something very similar, except incoming messages from never-seen-before senders are greylisted instead:
https://en.wikipedia.org/wiki/Greylisting_(email) https://en.wikipedia.org/wiki/Greylisting_(email)
95% of spammers never retry.
- lisper 2y agoThe problem with greylisting is that it delays subscription confirmation emails when you sign up for a new service. I found that to be more trouble than it was worth. YMMV.
- kees99 2y agoFor a greylisting that sends 451 before DATA, that is indeed a known problem. My server sends 451 after DATA, and keeps a copy of greylisted message, as marked-as-read entry in separate folder. Those are deleted after few hours, or moved out after a successful delivery retry.
- lisper 2y agoThat's a good idea. I was using an off-the-shelf greylister that didn't work that way, but I might implement that strategy now that I'm doing everything myself.