RE: [cobalt-users] Re: Returned email?

["John Burgess" <john.burgess@xxxxxxxxxx>]

Not the return address on the email, the reverse lookup address of the smtp
server making the connection.
This is quite common.

-----Original Message-----
From: cobalt-users-admin@xxxxxxxxxxxxxxx
[mailto:cobalt-users-admin@xxxxxxxxxxxxxxx]On Behalf Of Jeff Lasman
Sent: Monday, January 31, 2000 7:23 PM
To: cobalt-users@xxxxxxxxxxxxxxx
Subject: RE: [cobalt-users] Re: Returned email?


At 01:01 PM 1/30/00  John Burgess wrote:

>I believe the problem to be that although www.autobots.net resolves to
>198.92.128.204, a lookup on that ip address does not seem to resolve.
There
>does not seem to be a ptr record to the hostname for that ip address.  Some
>(most these days) smtp gateways are configured only to accept email from
>those hosts who can be verified that the ip address resolved from a name
>lookup resolves back to the same name when a reverse lookup is done.

Nope.  That'd be a pretty secure stance and would keep a large amount of
valid email from getting through, including lots of email from Major ISPs
dialup accounts.  What many (not yet most) MTAs do is verify that the IP
address resolves at all.  That means there's at least a point of
accountability.

(Check the headers on this post; you'll see I resolve, but NOT to my return
address.)

Jeff

--
Jeff Lasman, nobaloney.net
<jblists@xxxxxxxxxxxxx>
<www.nobaloney.net>, <www.mailtraqna.com>, <www.email-lists.com>


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