[Dovecot] Dovecot accepts squirrelmail, rejects fetchmail

[M. Fioretti]

Hello,

this is a follow-up to the thread "Fetchmail can't talk to dovecot"
http://www.dovecot.org/list/dovecot/2006-September/016477.html

Increasing the log level I get this in the log filed:

Sep 30 15:04:19 fm dovecot: Dovecot v1.0.rc7 starting up
Sep 30 15:04:22 fm dovecot: auth(default): passwd-file /etc/dovecot_user_file: Read 1 users
Sep 30 15:05:05 fm dovecot: auth(default): client in: AUTH      1       PLAIN   service=IMAPsecured
+lip=::ffff:SERVER_IP_HERE rip=::ffff:CLient_IP_HERE       resp=LONG_STRING_HERE             VDBB
Sep 30 15:05:05 fm dovecot: auth(default): passwd-file(user_name,::ffff:CLIENT_IP_HERE): unknown user
Sep 30 15:05:07 fm dovecot: auth(default): client out: FAIL     1       user=user_name
Sep 30 15:05:07 fm dovecot: imap-login: Aborted login: user=<user_name>, method=PLAIN, rip=::ffff:CLIENT_IP_HERE,
+lip=::ffff:SERVER_IP_HERE, TLS

Remember that when the same user name and password come from
Squirrelmail on the same host where dovecot runs, everything works.

Why does it fail with fetchmail? what does that message "unknown user" exactly mean?

Thank you in advance for any help,

Marco