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From: Mike on 2 Feb 2010 16:44
Andrzej Adam Filip wrote:
> Mike <test(a)test.org> wrote:
>> 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.
>
> FEATURE(accept_unresolvable_domains) is about "envelope sender".
> [ Email address in "MAIL FROM:" command in SMTP session ]
>
> FEATURE(require_rdns) allows to reject for missing revDNS of the sending host.
>
Thank you!

I see I need sendmail 8.14 or later for that feature. This is a CentOS
5 box so I think I'll wait 'til they (RedHat) starts including sendmail
8.14. Or I guess alternatively I could use the hack I've seen floating
around. ?
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