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From: Harry Putnam <reader@newsguy.com>
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Subject: Re: smtp authentication (sendmail relay)
Date: 17 Dec 2000 15:31:07 -0800
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Lloyd Zusman <ljz@asfast.com> writes:

> Well, the only thing I can think of is reverse DNS.  Many servers
> don't allow connection to them unless the connecting host's IP address
> has a valid reverse DNS entry.  The IP address of machine from which I
> was connecting indeed does have a valid reverse DNS entry, and so
> perhaps this is why my connection works.

Bingo... I think you've hit on it.  Turns out I can connect to
smtp.newsguy.com from my DSL connection at a different location. 
(Same ISP)  So apparently they are not supplying it for dialin
accounts.