According to logwatch, repeatedly - I have issues with: dovecot-auth: Deprecated pam_stack module called from service "dovecot" Running Centos 5 dovecot 0.99.14 postfix 2.3.3 pam 0.99.6.2 Any idea of why and how I could sort this issue would be greatly appreciated. Thanks, Amb. Edit: Well, I've changed the auth_passdb = pam to a different password db, so we'll see if that helps. The error message seems pretty straightforward. But I don't see why they would still offer the use of pam as an authentication method if the pam_stack module is deprecated. Anyway, we'll see...