Looking at sendmail.mc shows the listing:
FEATURE(`accept_unresolvable_domains')dnl
So apparently my Sendmail server is accepting mail from unresolvable domains
the opposite of what Craig stated below.
The important point is that what I thought was a hack or open-relay was
Sendmail running as instructed.
Also, it appears that if I turn this feature off, email from our users
off-site would be rejected. If I could turn it off, it would surely knock
down the spam.
--Bill
----
seems as though, this would be good administration... if
/etc/mail/sendmail.mc has a line like,
dnl FEATURE(`accept_unresolvable_domains')dnl
sendmail will not accept mail from unresolvable mail server. Seems
reasonable enough to me. If that troubles you, remove the dnl at the
start of the line and regenerate your sendmail.cf to allow it to accept
mail from unresolvable domains.
As far as testing for open relay, go for it.
Craig
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