note: local socket changed to /var/spool/milter-regex/spool, adjust
sendmail.cf/.mc accordingly when updating:
-`S=unix:/var/spool/milter-regex, T=S:30s;R:2m'
+`S=unix:/var/spool/milter-regex/sock, T=S:30s;R:2m'
by ports have to have a leading '_' and a fixed id. They have also to
be added to db/user.list.
user.db and createuser are not used and are superfluous now.