It appears that Bastian Blank via mailop <bbl...@thinkmo.de> said: >On Sat, Jul 24, 2021 at 05:14:17PM +0200, Xavier Beaudouin via mailop wrote: >> I use greylisting... > >So there we have the problem. Microsoft decided to implement a >mailsystem that does not use the same IP for different delivery >attempts. > >Not really common, but not forbidden.
That is extremely common for large ESPs and ISPs. In my greylister, I fuzz the address to /24 in ipv4 and /64 in ipv6, and there's still a few I had to whitelist manually. Before someone says "oh they must be spammers", no, they're not, I can see from the envelope addresses that the mail looks reasonable. Anuway, spammers use botnets which don't retry at all. Even after greylisting for a decade, 60% of the IPs I greylist never come back. R's, John _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
