Посмотрите овнера для файла с именем юзера в /var/mail/ - чья авторизация не проходит(она должна соответствовать авторизирующемуся, а группа должна быть mail).
Каталог пуст .
Зато есть /home/vmail/domain.ru/user
deliver(test@test1.ru): 2009-01-04 23:04:09 Error: namespace configuration error: list=yes requires prefix=INBOX. to end with separator
deliver(test@test1.ru): 2009-01-04 23:04:09 Fatal: Namespace initialization failed
an 5 16:17:36 mx dovecot: auth-worker(default): mysql: Connected to 127.0.0.1 (mailserver)
Jan 5 16:18:46 mx dovecot: auth-worker(default): pam(denis,172.16.10.102): pam_authenticate() failed: Authentication failure
Jan 5 16:18:46 mx dovecot: auth-worker(default): mysql: Connected to 127.0.0.1 (mailserver)
Jan 5 16:18:48 mx dovecot: imap-login: Disconnected (auth failed, 1 attempts): user=<denis>, method=PLAIN, rip=172.16.10.102, lip=172.16.10.102, secured
Jan 5 16:18:58 mx dovecot: auth-worker(default): pam(denis@dmdinfo.ru,172.16.10.102): pam_authenticate() failed: Authentication failure
Jan 5 16:18:58 mx dovecot: imap-login: Login: user=<denis@dmdinfo.ru>, method=PLAIN, rip=172.16.10.102, lip=172.16.10.102, secured
Jan 5 16:18:58 mx dovecot: IMAP(denis@dmdinfo.ru): namespace configuration error: list=yes requires prefix=INBOX to end with separator
Jan 5 16:18:58 mx dovecot: Fatal: IMAP(denis@dmdinfo.ru): Namespace initialization failed
Jan 5 16:19:15 mx dovecot: auth-worker(default): pam(denis,172.16.10.104): pam_authenticate() failed: Authentication failure
Jan 5 16:19:17 mx dovecot: pop3-login: Disconnected (auth failed, 1 attempts): user=<denis>, method=PLAIN, rip=172.16.10.104, lip=172.16.10.102
Jan 5 16:19:21 mx dovecot: auth-worker(default): pam(denis,172.16.10.104): pam_authenticate() failed: Authentication failure