It appears that Laura Smith via Postfix-users <n5d9xq3ti233xiyif...@protonmail.ch> said: > > > >> My doubt is that since the outgoing email server identifies itself as >> host1.example.com in the EHLO, is there a requirement or even an >> expectation that postmas...@example.com will be able to receive email. > > >I think the reality is that we are in 2024, and the chances of a human reading >postmaster@ are about the same as a human reading abuse@ .... >i.e. nil. > >The whole null-MX thing is very much perceived as the gold standard in >security conscious environments,
The reason we did null MX is to prevent fallback to A records. If you have a domain that accepts no mail, but has an A record because it has a web server, if you try and send it mail your mail server will try and fail to connect to the A record server until it times out, probably a day or two later and only then will you get the failure message. If you publish MX 0 . the mail will fail instantly and you'll know right away. I suppose there is some benefit in keeping probes away in case you screw up your config and enable a mail server by default, but the places that sweep the whole IP space will find them anyway. R's, John _______________________________________________ Postfix-users mailing list -- postfix-users@postfix.org To unsubscribe send an email to postfix-users-le...@postfix.org
