Setting up again

Hello everybody,

I'm soon going to upgrade my server OS to FreeBSD 5.4
(backup-format-reconfigure). I initially set it up in 2002 and received lots
of good suggestions and help from the users on this list for email setup;
the final installation comments are at
http://lists.untroubled.org/?list=bgware&cmd=showmsg&msgnum=1385 
 
In light of the new setup I'm going through the applications and considering
the best configuration. The current/old configuration doesn't implement TLS
which I would like to have, and I would also really like to add low-level
(SMTP) verification of the allowed email addresses (maybe pulling the valid
addresses from LDAP) so that if an email arrives to an email account that
doesn't exist on the system, SMTP server would reject the connection.

Finally, since I use IMAP extensively, I would like to upgrade to
Courier-IMAP 4.x (currently using 3.0.8), but apparently the interface
between 4.x and vmailmgr isn't there yet. I know the encroaches vmailmgr
list side as well, but I rather not double-post. Do people here use other
IMAP solutions than Courier-IMAP with vmailmgr/mailfront? And, Bruce, what
is the current status with the new version of vmailmgr?

Thanks again for any advice! 

// Ville