add examples of using an access_db
update .mc files to match recommendations on
http://www.sendmail.org/m4/anti-spam.html
(grrr.....should have been one commit
did the last commit from a subdirectory)
domains/ips listed in these files are *NOT* filtered,
even if listed in domains.txt or ips.txt.
someone added netcom.com to the domains.txt file,
resulting in all mail from netcom.com being blocked.
break each ruleset into identified sections. (called groups).
note which groups can be reordered.
each group accepts and returns the same strings,
as much as possible.
reactivate Paul Vixie's RBL (in check_mail)
add rules to limit mail relaying to a list of hosts and domains
in the R class (check_rcpt, not active on hub.freebsd.org)
Submitted by: jmb
