I am quite curious about the circumstances of this question. I was not aware that Dovecot actually offered mail submission service. If Dovecot does offer such a service, then it will have to relay the submitted mail to the real MTA, which is very likely not Dovecot. At the moment I have Postfix set up as MTA for that purpose —
Relaying on port 25 is usually quick and easy to whitelist for certain permitted hosts, but otherwise port 587, optionally with STARTTLS, and/or port 465 with SSL/TLS is generally set up for user authenticated mail submissions. See also: https://www.mailgun.com/blog/which-smtp-port-understanding-ports-25-465-587/ On July 28, 2021 6:10:28 AM AKDT, Dan Conway <darkc...@archnix6.net> wrote: >Hello, > >Is it possible to disable the requirement for authentication on the >submission service? I'm trying to require authentication for all, >except >for a handful of IP addresses. > >Thank you. > > >ehlo test.com >250-aaa >250-AUTH PLAIN LOGIN >250-BURL imap >250-CHUNKING >250-DSN >250-ENHANCEDSTATUSCODES >250-SIZE >250 PIPELINING >MAIL FROM:<t...@test.com> >530 5.7.0 Authentication required. -- Sent from my Android device with K-9 Mail. Please excuse my brevity.
