Carbon runs qmail 1.03 with ezmlm-idx, procmail and a version of the
Courier imap server modified to do kerberos authentication.  SSL imap
is supported.  

Club account holders have local disk space in /home into which mail is
delivered.  If you are using procmail, your .procmailrc needs to tell
procmail that its working in a directory different from what the
passwd file says your home directory is; you can accomplish this with
somthing like the following at the beginning of .procmailrc:

HOME=/home/username
MAILDIR=/home/username/Maildir
DEFAULT=/home/username/Maildir/
ORGMAIL=/home/username/Maildir/

See procmailrc(5) for more info.

Procmail can deliver to qmail-style maildirs.  Courier will only serve
maildirs.  Mail is delivered to /home/username/mail/Inbox by default
so you will need to set up .qmail (dot-qmail(5)) and create a maildir 
(maildirmake(1)) to use IMAP.

Ezmlm is nifty mailing list software that is much nicer than majordomo
or AMS/Andrew dlists.  See ezmlm-make(1) and www.ezmlm.org for
documentation.

We offer virtual mail hosting as a service.



Carbon runs /afs/club/system/scripts/perl/mailassign.pl hourly to
update /var/qmail/users/assign according to the club passwd file along
with:

/afs/club/service/mail/mailnames 
/afs/club/service/mail/subusers 

These files are identical to those with the same names used by
qmail-pwd2u(8); this perl script has to munge the pathnames a little
more since mail goes into /home rather than what the passwd file says
$HOME is.