On the error attempt

On the success attempt

This is the cause of it and I think it must be configurable on the email client 
app side.
If not you may have to configure dovecot to support this Auth mechanisms (which 
I’ve never eard of).

This link may help you: 


From: Fabio Mecchia [mailto:ktf4...@gmail.com] 
Sent: 27 de janeiro de 2022 10:16
To: qmailtoaster-list@qmailtoaster.com
Subject: [qmailtoaster] Weird problem on pop3 connection


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=<x...@xxxxxx.it>, 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=<x...@xxxxxx.it>, 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 

The server is up to date, dovecot version is



Any suggestions are welcome


Fabio Mecchia



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