I wonder if other people are seeing stability issues with Dovecot and imap-login against LDAP? 
I've changed from pam_nss to ldap without nss in Dovecot to see if that helps the issue. I realise
Dovecot is version 1.0 in Centos 5, would it be more advisable to switch to Cyrus? I'm using mbox
mail spool files would that work with Cyrus?

Chris