Over the last week or so I have come across two posts showing how to set up a FreeBSD based email server. If this is something you have been wanting to do, have a look at the following two links.
1. FreeBSD 9 Mail server setup: Postfix, Dovecot 2, Virtual Users, MySQL, SASL, Postfixadmin and others (ghid-it)
For long time I used FreeBSD to serve email to corporate customers or other tasks. Now I will show how I did package installation and configuration for an email server with virtual email users, using the following components
2. Installing Qmail on FreeBSD 9.x
Bill from freebsdrocks.net has 21 howtos for setting up QMail on FreeBSD, with anti-spam support, virus checking etc.