FreeBSD comes by default with sendmail email server installed, but its not secure and scalable enough.
Building secure Email Server from scratch is a huge task, because it need many component to be installed and configured.
My objective was to build a secure, fast, reliable email server, very less and optimized system resource, using SSL, have a web interface for administration, web interface for clients, can be accessed by email clients application like Microsoft outlook and Microsoft outlook express, also my email server should be protected against spam and virus scan capabilities.
Secure Email Server component include:
- Install and configure Apache server.
- Install and configure PHP.
- Install and configure MySql server.
- Create SSL/TLS certificate using openssl.
- Install and configure Dovecot POP3/IMAP server.
- Install and configure PostFix the alternative to Sendmail.
- Install and configure PostFixAdmin.
- Install and configure squirrelmail.
- Install and configure SpamAssassin.
one of the best articles I found on the web, which go step by step to install a secure email server on FreeBSD here