I having a problem with using Winbind for authentication to a Windows 2003 AD. The serving is being used as a pop3 mail server. If I run ?getent passwd <username>?, nothing is returned. If I run ?getent passwd?, I get the imformation expected. If I then run ?getent passwd <username>?, I get the user information. Running ?getent passwd? seems to keeping it working for a few minutes for most users. The users it works for changes. I have put it in a cron job to run every minute. That had help a lot. The message below is what is recorded in the messages log: Jun 15 14:10:36 sendmailrh01 dovecot(pam_unix)[19486]: check pass; user unknown Jun 15 14:10:36 sendmailrh01 dovecot(pam_unix)[19486]: authentication failure; logname= uid=0 euid=0 tty= ruser= rhost Jun 15 14:10:36 sendmailrh01 dovecot-auth[19486]: pam_krb5[19486]: error resolving user name 'dan' to uid/gid pair Jun 15 14:10:36 sendmailrh01 dovecot-auth[19486]: pam_krb5[19486]: error getting information about 'dan' Thanks, Kyle