In my /etc/dovecot/toaster.conf I Have: auth_mechanisms = plain login digest-md5 cram-md5
while the /etc/dovecot/conf.d/10-ssl.conf is the same as yours with : ssl = required I've found this on the dovecot mailing list : https://dovecot.org/pipermail/dovecot/2020-August/119760.html Regards Fabio Il giorno gio 27 gen 2022 alle ore 15:18 Eric Broch <[email protected]> ha scritto: > This is my /etc/dovecot/toaster.conf dovecot authorization mechanisms: > > auth_mechanisms = plain login > On 1/27/2022 3:16 AM, Fabio Mecchia wrote: > > Hi everyone, > I have been having a weird problem connecting pop 3 to my corporate > server from Outlook and Thunderbird for about two weeks. > When the client tries to connect to the server, I got this error message > "-ERR [AUTH] Unsupported authentication method" and in the Dovecot logs I > found errors like "pop3-login: Info: Disconnected (tried to use unsupported > auth mechanism): user=<[email protected]>, method=USER, rip=xxx.xxx.xxx.xxx, > lip=xxx.xxx.xxx.xxx, TLS, session=<bXG42jTVxNtc3/SS> > " . > The strange thing is that the same client checks multiple boxes on the > same domain and not all of them give an error, also the error occurs > randomly, maybe for half a day it is impossible to download the mail and > then suddenly it works for a couple of hours. > Using the imap protocol there are no problems. > When the clients manage to connect I find this in the Dovecot logs > "pop3-login: Info: Login: user=<[email protected]>, method=DIGEST-MD5, > rip=xxx.xxx.xxx.xxx, lip=xxx.xxx.xxx.xxx, mpid=5510, TLS, > session=<+0htGDnVWPdc3/SS>", I don't know why on the same client without > changing anything the method switch from USER to DIGEST-MD5 > The server is up to date, dovecot version is 2.3.11.3 > > > Any suggestions are welcome > > Fabio Mecchia > > > <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> > Mail > priva di virus. www.avg.com > <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> > >
