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From: Mike on 2 Feb 2010 16:13
I've noticed a lot of spam with unresolvable domains lately.

Received: from parse-2a98e1d46 ([81.90.152.240])
by mydomain.com (8.13.8/8.13.8) with SMTP id o12JU8bO032012
for <validuser(a)mydomain.com>; Tue, 2 Feb 2010 12:30:15 -0700

But 81.90.152.240 does not reverse e.g., it has no PTR record.

The sendmail.mc file on this MX server has the line:

dnl FEATURE(`accept_unresolvable_domains')dnl

I'm at a loss as to why sendmail isn't rejecting this.
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