Procmail

Spamassassin setup with Postifx and Procmail:
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Local.cf:

# SpamAssassin config file for version 2.5x

# How many hits before a message is considered spam.
required_hits           4.0

# Whether to change the subject of suspected spam
rewrite_subject         1

# Text to prepend to subject if rewrite_subject is used
subject_tag             *****SPAM*****

# Encapsulate spam in an attachment
report_safe             1

# Use terse version of the spam report
use_terse_report        0

# Enable the Bayes system