Hi Ed,
The first thing I checked was Reverse DNS - it's absolutely perfect - I
even checked it using remote systems - and DNS verifiers. Rock and
Roll. As far as Black Lists - I will check ORBS and a couple others -
but this is a Capital Management company - nothing but first class
people (and business practices) and they never did a mass mail in their
lives - so I just can't fathom them being on any type of list. Ok -
just checked it - they are on NO blacklists.
It's possible they are lumping this particular error message with all
the other crap they are throwing at us - saying, that it's happening
more than once. I *know* the unknown user error is happening often -
and that's my #1 concern right now. I really don't feel that the other
problem mentioned above is happening often at all. Today is the first I
heard of that particular one.
Now regarding the NDR (for the Unknown User error) - here it is:
> Unknown user: [EMAIL PROTECTED]
>
>
> Original message follows.
>
> Received: from UltimaThule [66.73.199.56] by clovisinc.com
with ESMTP
> (SMTPD32-6.06) id A9944C510150; Mon, 26 May 2003 15:31:16
-0500
> Message-ID: <[EMAIL PROTECTED]>
> From: <[EMAIL PROTECTED]>
> To: "Kim Kolesar" <[EMAIL PROTECTED]>
> Cc: "Matt Versaggi" <[EMAIL PROTECTED]>
> Subject: Fw: Undeliverable Mail
> Date: Mon, 26 May 2003 15:31:14 -0500
> MIME-Version: 1.0
> Content-Type: text/plain;
> charset="iso-8859-1"
> Content-Transfer-Encoding: 7bit
> X-Priority: 3
> X-MSMail-Priority: Normal
> X-Mailer: Microsoft Outlook Express 6.00.2800.1106
> X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106
If anybody has any ideas, or anything I should check, please let me
know.
Thanks,
Mike
-----Original Message-----
From: Ed Crowley [mailto:[EMAIL PROTECTED]
Sent: Wednesday, May 28, 2003 10:24 PM
To: Exchange Discussions
Subject: RE: Unknown User problems (help!)
Please post the entire NDR.
In response to the second question, it appears that your server is being
rejected. Two reasons this might occur is that you don't have a valid
reverse DNS (PTR) entry, or you are on one or more realtime blackhole
lists (RBLs).
Ed Crowley MCSE+I MVP
"There are seldom good technological solutions to behavioral problems."
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Mike Anderson
Sent: Wednesday, May 28, 2003 6:08 PM
To: Exchange Discussions
Hello,
Ever since we moved our business to another building down the road, and
switched ISP's (with a new block of IP's), our Exchange Server has been
acting up.
We didn't have to change hardly anything after moving - except some IP
addresses on the ISA Firewall Server's external interface, and some DNS
settings on the Exchange Server (for outgoing mail DNS resolution).
>From time to time, external users that are sending e-mail to users on
the Exchange Box, are getting "Unknown User" error messages. This has
NEVER happened before - and am desperately trying to figure out, how
changing ISP's, can cause all these problems. How the heck could a
remote system, get as far as opening a connection all the way to the
Exchange Box, and once authenticated etc., it's unable to find a
particular user on the system - when they are there plain as day??? This
server has never hiccupped a single time before the move -
Also, (here is another good one), on AOL and similar systems, from time
to time, users that had no problem before the move, could send mail to
particular users with no problems, are NOW they are getting similar
error
messages:
> The following recipient(s) could not be reached:
> [EMAIL PROTECTED] on 5/28/2003 4:37 PM
> The e-mail account does not exist at the organization this
> message was sent to. Check the e-mail address, or contact the
> recipient directly to find out the correct address.
> < rly-xg03.mx.aol.com #5.1.1 SMTP; 550 geomarxxx IS NOT
ACCEPTING MAIL FROM THIS SENDER >
Does anybody have ANY ideas as to what is going on here?
Our client is really getting irritated - and I have been working day and
night, making sure DNS is setup right, our Reverse DNS is setup right
(with our new IP's), just anything else that I thought of...
Thanks in advance for any information offered,
Mike
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