Seeking Mail Server Suggestions

I'm not new to FreeBSD or Apache, but I am new to the
world of email serving. Some of my friends and
classmates have a server for hosting our project
websites on several domains, but we don't currently
host our own email. (Sendmail scared us!!) We have
been doing some research into the topic and have found
lots of information on specific areas, but no good
general discussion. Because of this, I ask you for
your experienced advice. What do you recommend we look
into for running our own complete mail system? Our
current setup is explained below, as are our goals for
email. We don't see instructions, just some advice and
pointers, such as which daemons/packages to user and
which to avoid.

Currently:
* FreeBSD 5.4 on 933 MHz Pentium3, 768 MB RAM
* Apache
* ~12 user accounts, ~6 groups
* Perl scripts to handle adding/deleting users and
maintaining web space for projects and for users.
* No databases, just perl scripts and flat files.

Email Goals:
* Incoming (via Postfix?)
* Outgoing (via Postfix and POP-before-SMTP or other
authentication?)
* IMAP and POP3 (Courier?)
* Webmail (OpenWebMail or maybe SquirrelMail)
* Spam filtering (via SpamAssassin?)

One other additional goal is to maybe implement some
sort of user database to help maintain the server (or
a cluster of servers) as our needs grow. Maybe
something with OpenLDAP or MySQL. It might be handy to
have various flags/settings for each user account, to
enable or disable "features" like "SSH Shell Access"
or to adjust quotas for each user from a central
location. We don't want or need anything overly
complex or pre-fab, but it would be nice to automate
and organize some of this information and these tasks.

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