Simpler postfix + dspam
I have read a shitload of overcomplicated setups to bring up a postfix / dspam SMTP + antispam server, and finally came to a much lighter and simpler configuration by basically reading documentation and real life examples. Note this is suitable for a personnal and basic environment, no database, no virtual setup. Basic stuff.
The target system is NetBSD but this short doc should apply to pretty much any UNIX / Linux.