Blacklisting Example

First, configure pf:

table <spamd> persist

rdr pass inet proto tcp from <spamd> to any port smtp -> 127.0.0.1 port 8025

Blacklists are configured in /etc/spamd.conf

all::spamhaus

spamhaus::black::msg="%A is in the Spamhaus Block List See http://www.spamhaus.org/sbl"::method=http::file=www.openbsd.org/spamd/SBL.cidr.gz

And sent to a running spamd by running spamd-setup in a cron job.

0 * * * *       /usr/libexec/spamd-setup