Connected to blabla.bla Escape character is '^]'. * OK Courier-IMAP ready. Copyright 1998-2001 Double Precision, Inc. See COPYING for distribution information. a login user pass a NO Login failed. The same user can login with SSH and FTP /var/log/syslog says: Feb 5 15:09:40 hydrogen imapd: Connection, ip=[::ffff:1.2.3.4] Feb 5 15:09:53 hydrogen imapd: LOGIN FAILED, ip=[::ffff:1.2.3.4]
Edit /etc/courier-imap/authdaemonrc and replace authmodulelist= with authmodulelist="authpam"