[Esd-l] Sendmail unresolvable_domains

Fred Laxton securitynotice at laxton.net
Fri Jun 25 09:08:57 PDT 2004

Enabling that feature will get you more spam, not less.  It means the 
spammer can use any bogus domain in the from address and Sendmail will 
allow it.

Scott Taylor wrote:
> Hello all,
> I remarked out this feature from the sendmail.mc file:
> FEATURE(`accept_unresolvable_domains')dnl
> (and ran make and restarted sendmail)
> thinking that it would stop a lot of SPAM, and it seems to have helped,
> but, I still get messages with headers like this:
> Received:  from ([]) by mustang.dctchambers.com
> (8.12.11/8.12.11) with SMTP id i5P0I4gi010468; Thu, 24 Jun 2004 17:18:06
> -0700
> How do I stop this type of abuse?  As you may have noticed, the HELO
> address is my mail server's IP, which would never happen, my mail server
> uses and resolves it's own local name or Localhost.
> --
> Scott
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