> On 22/01/2024 17:16 EET Steve Dondley via dovecot <dovecot@dovecot.org> wrote: > > > > there is no user in the above line > > > >> Some characteristics of the problem that may offer a clue: > >> * happening with multiple users, not just the same one > >> * happens from different IP addresses. > > > > bots detected > > The problem is happening to real users on real devices who are reporting very > real connection errors, not bots. > > > > >> * happens about 3 to 5 times per day and the errors come in batches like > >> above > >> * MS Outlook error is: > > > > why is it a microsoft problem now ? > > > >> reported error (0x80042109): ‘Outlook cannot conect to your outgoing SMTP > >> email server. If you continue to receive this message….blah blah blah > > > > disable pop3 in dovecot, problem is then gone > > The same problem happens on IMAP. Example from log: > > Jan 21 01:51:55 ip-172-30-0-131 dovecot: imap-login: Disconnected (no auth > attempts in 0 secs): user=<>, rip=87.xxx.xxx.xxx, lip=172.30.0.131, TLS > handshaking: read(size=598) failed: Connection reset by peer, > session=<ctMkJm8PM9RX7LDO> > >
Hi! Ensure your config says auth_mechanisms = PLAIN LOGIN and that you do not enable "Secure Password Authentication (SPA)" on the client unless you've done the necessary preparations. Aki _______________________________________________ dovecot mailing list -- dovecot@dovecot.org To unsubscribe send an email to dovecot-le...@dovecot.org
