SMTPD Filtering

    smtpd receives mail and stores it (sendmail -bd replacement)

        smtpfwdd passes it to sendmail or can relay to another machine

    Pretends not to be OpenBSD ("4.1 SMI" :-)

    Runs in chroot jail /var/spool/smtpd

    ./etc/smtpd_check_rules

Another hand-drawn table, which isn't here. Part of the value-add for paying to attend the tutorial. :-)