Hello,
On Sat, 24 Jul 2021 at 21:22, John Levine via mailop <mailop@mailop.org> wrote: > > 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. See SPF-aware greylisting: https://poolp.org/posts/2019-12-01/spf-aware-greylisting-and-filter-greylist/ Lukas _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
