Configure Spamassassin & Install SPF

What is Spamassassin ?

SpamAssassin is a computer program released under the Apache License 2.0 used for e-mail spam filtering based on content-matching rules. SpamAssassin uses a variety of spam-detection techniques, including DNS-based and checksum-based spam detection, Bayesian filtering, external programs, blacklists and online databases.

Configure Spamassassin

Note:
We don't need to install spamassassin again because when we install amavisd-new it's automatically install spamassassin as amavisd dependency. so we just need to configure it.

cd /usr/local/etc/mail/spamassassin/
pico local.cf

### below are spamassassin settings ###

required_hits 10.0
report_safe 1
rewrite_header Subject [SPAM]
required_hits 10.0
rewrite_subject 1
use_bayes 1
bayes_auto_learn 1
skip_rbl_checks 1
use_razor2 0
use_pyzor 0
ok_locales all

Install SPF Policy

cd /usr/ports/mail/postfix-policyd-spf
make install clean