Hi Wietse, you made my day!
That was just the perfect answer after two days of total despair (though I learned a lot about mail mechanisms and the communication involved ;-) -- Orm Am Donnerstag, 28. Februar 2019 13:21 CET, Wietse Venema <wie...@porcupine.org> schrieb: > Orm Finnendahl: > > Hi, > > > > after upgrading my system, sending mails with postfix to a relayhost using > > dovecot for STARTTLS fails (it used to be working for years without > > problems before). > > > > The logs of the relayhost show that a TLS connection gets established and > > the (debian postfix) relay server then offers "250-AUTH PLAIN CRAM-MD5 > > NTLM" and "250-AUTH=PLAIN CRAM-MD5 NTLM". My client then issues "AUTH > > NTLM..." rather than using PLAIN which ultimately fails on the server. > > > > Is there any way to force using the AUTH PLAIN method from the client's > > side? > > > > I'm using postfix 3.3.3, authentification uses dovecot v2.3.4.1 > > http://www.postfix.org/postconf.5.html#smtp_sasl_mechanism_filter > > Wietse
