smtp server test?

[Dave]

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On Tue, 15 Mar 2005 11:22:30 -0800, Scott Silva <ssilva at sgvwater.com> wrote:
> Joe Smith wrote:
> > Any sendmail experts know of a milter that will check an inbound
> > connection for a listening mail server?    Gotta be 90+ percent of
> > spammers and virus connections don't have a listening smtp server.
> >
> I'm not sure if RFC's require a sending SMTP to also be a receiver.
> Some large senders probably have separate sending and receiving mailers,
> and you would get some false positives.
> You could test for reverse-resolution, but there are a few legit.
> mailers that have that broken also.

 I'm not a large corp, just a small NPO and we have 2 mail servers,
one inbound with Mailscanner and outbound on another IP/machine. So we
would fail that check also.

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