this is log of mail server, here it seems all right
Jul 3 11:54:27 vps2p courier-imapd: Connection, ip=[::ffff:127.0.0.1]
Jul 3 11:54:27 vps2p courier-authdaemon: received auth request, service=imap, authtype=login
Jul 3 11:54:27 vps2p courier-authdaemon: authpsa: trying this module
Jul 3...