[root@localhost init.d]# ./dovecot start
Starting DovecotLast died with error (see error log for more information): Auth process died too early - shutting down
If you have trouble with authentication failures,
enable auth_debug setting. See http://wiki.dovecot.org/WhyDoesItNotWork
This message goes away after the first successful login.
Aug 19 01:20:17 localhost dovecot: Dovecot v1.2.10 starting up (core dumps disabled)
Aug 19 01:20:17 localhost dovecot: auth(default): Fatal: Support not compiled in for passdb driver 'pam'
Aug 19 01:20:17 localhost dovecot: dovecot: Fatal: Auth process died too early - shutting down