How to make Courier-IMAP log to lastlog using pam_lastlog

[ATC]

I have a ton of accounts on my server, but I have no idea which ones are actually in active use. Courier-IMAP created two files in /etc/pam.d aptly named 'imap' and 'pop3'.

Reading the man page for pam_lastlog and trying to understand how PAM works, I have tried adding 'session    required      pam_lastlog.so silent' to both files. (The 'silent' keyword is used to suppress the information message typically shown when using ssh or telnet to log in)

auth       required     pam_nologin.so
auth       required     pam_stack.so service=system-auth
account    required     pam_stack.so service=system-auth
session    required     pam_stack.so service=system-auth
session    required      pam_lastlog.so silent

Unfortunately, the monster that is PAM refuses to cooperate.... what am I doing wrong?

[ATC]

Unfortunately, the current version of Courier-Auth does not seem to call pam_session_start() and pam_session_stop().