courier-users
  - an unmoderated general mailing list for questions, bug reports,
  and comments that do not belong in any of the other lists (see
  below). Go to
  http://lists.sourceforge.net/mailman/listinfo/courier-users
  to subscribe to courier-users, or send a message to
  <courier-users-request@lists.sourceforge.net>
  and put "subscribe" in the subject line. Search the list archives
  at http://markmail.org/browse/net.sourceforge.lists.courier-users.
courier-announce
  - a read-only, low volume, list for administrative messages only
  (such as new releases, bug fixes, et al). Go to
  http://lists.sourceforge.net/mailman/listinfo/courier-announce
  to subscribe to courier-announce, or send a message to
  <courier-announce-request@lists.sourceforge.net>
  and put "subscribe" in the subject line. Search the list archives
  at 
  http://markmail.org/browse/net.sourceforge.lists.courier-announce.
courier-imap
  - an unmoderated mailing list specifically about the IMAP (and
  the POP3) server. Go to
  http://lists.sourceforge.net/mailman/listinfo/courier-imap
  to subscribe to courier-imap, or send a message to
  <courier-imap-request@lists.sourceforge.net>
  and put "subscribe" in the subject line. Search the list archives
  at http://markmail.org/browse/net.sourceforge.lists.courier-imap.
The SqWebMail mailing list, 
  courier-sqwebmail, is for the standalone version of the
  Courier mail server's Webmail server. Go to
  http://lists.sourceforge.net/mailman/listinfo/courier-sqwebmail
  to subscribe to courier-sqwebmail, or send a message to
  <courier-sqwebmail-request@lists.sourceforge.net>
  and put "subscribe" in the subject line. Search the list archives
  at 
  http://markmail.org/browse/net.sourceforge.lists.courier-sqwebmail.
The maildrop mailing list, courier-maildrop,
  is for the standalone version of the Courier mail server's
  mail filter, maildrop. Go to
  http://lists.sourceforge.net/mailman/listinfo/courier-maildrop
  to subscribe to courier-maildrop, or send a message to
  <courier-maildrop-request@lists.sourceforge.net>
  and put "subscribe" in the subject line. Search the list archives
  at 
  http://markmail.org/browse/net.sourceforge.lists.courier-maildrop.
There is some support for the Courier mail server in several virus scanners. The following information may or may not be out of date.
NOTE:
Be sure to check the documentation of your virus scanner for the specific versions of the Courier mail server that the vendor has certified their product with. The Courier mail server's virus-scanning API is generally stable, and it does not change frequently. In fact, it hasn't changed at all, since its inception. However, it's always possible that technical reasons may require an API change at some point in the future, so it is important to determine which versions of the Courier mail server the vendor has tested their scanner against.
avfilter for Sophos Anti-Virus
A multi-threaded C++ filter for the Courier mail server that scans incoming mail for viruses using Clam Antivirus.
couriermlm templates#courier on
    the Freenode IRC network (irc.freenode.net)