on x86_64 systems courier-imap uses gamin to monitor file modifications in mailboxes, users with larger mailboxes trigger 'excessive resource usage' messages because gamin stays open for the duration of their session.
Was just dropping the hint that it possibly should be included in lfd's process whitelist by default.
obviously this is very simple to do manually after install, but just thought I'd mention it...
exe:/usr/libexec/gam_server