Undeliverable Mail

Hi All,

A company I work with cannot send mail to my domain, when they attempt to send to my domain they get the following.

"Undeliverable: Your message did not reach some or all of the intended recipients.

      Subject:      FW: Test from
      Sent:      6/26/2009 2:23 PM

The following recipient(s) cannot be reached:

      user@mydomain.com on 6/26/2009 10:29 PM
            Could not deliver the message in the time limit specified.  Please retry or contact your administrator.
            <server.theirdomain.local #4.4.7>

      anotheruser@mydomain.com on 6/26/2009 10:29 PM
            Could not deliver the message in the time limit specified.  Please retry or contact your administrator.
            <server.theirdomain.local #4.4.7>"

Their IT group has told the users getting NDRs that it is something on my end that is preventing the mail from going through.  I am looking for advice to figure out what the problem is, we had just recently switched ISP's and I suspect it may have something to do with that.  

Thanks
-Cody
cody426Asked:
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Alan HardistyCo-OwnerCommented:
Do mails get delivered directly to your mail server?
If so, check you MX records on http://www.mxtoolbox.com/
Do the MX record(s) point to your IP Address?
Test Mail connectivity on http://www.mxtoolbox.com/diagnostic.aspx to see if your mail server is contactable.
Check your external IP Address is what you expect it to be on http://www.whatismyip.com
If your emails get delivered to a 3rd party first, call them to see if they have problems.
Are you using any spam / Anti-Virus filtering software?
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cody426Author Commented:
alanhardisty;

Mail does go directly to my server. the MXrecord looks correct (my IP).

The SMTP Diag seemed good as well, here is what I got.

RESULT: mail.mydomain.com
Banner: 220 mail.mydomain.com Microsoft ESMTP MAIL Service, Version: 6.0.3790.3959 ready at Mon, 29 Jun 2009 10:18:24 -0700
Connect Time: 0 seconds - Good
Transaction Time: 0.344 seconds - Good
Relay Check: OK - This server is not an open relay.
Rev DNS Check: OK - XXX.XXX.XXX.5 resolves to mail.mydomain.com
GeoCode Info: Geocoding server is unavailable
Session Transcript: HELO please-read-policy.mxtoolbox.com
250 mail.mydomain.com Hello [64.20.227.13 [78 ms]
MAIL FROM: <test@mxtoolbox.com>
250 2.1.0 test@mxtoolbox.com....Sender [94 ms]
RCPT TO: <test@mxtoolbox.com>
550 5.7.1 Unable to relay for test@mxtoolbox.c [78 ms]
QUIT
221 2.0.0 mail.mydomain.com Service closing transmission chann [94 ms]
 
I do not work with any third party email providers.  I had run these tests previous to posting here and after reading many other posts, and from what I see they seem fine, maybe I'm missing something.

I am using AVG 8.5 on the Exchange server.  This server has been running for over a year now with no confiugration changes besides the AV (switched from Symantec 10.2 to AVG) which was changed about 5 months back.  This is the only domain I am aware of that gets NDR's when sending to my domain.

Thanks
-Cody
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Alan HardistyCo-OwnerCommented:
Did you check your current IP on www.whatismyip.com ?
Can you email your domain details, your Internet IP address, the domain name / IP of the company having problems sending you emails please - details in my profile.
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Alan HardistyCo-OwnerCommented:
Thanks for your email.  I have checked out both sides and all appear to be quite happy, so there seem to be an issue on the sending side as they cannot find you in DNS, despite it working happily for me.
How long ago did you switch ISP and if less than 48 hours, this could be the reason?  If longer than 48 hours, then please call the senders IT department and ask them to investigate the problems.
Your end seems all clear.
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cody426Author Commented:
It has been almost 2 weeks since the change in ISP, and no other domains have contected me about the inibility to send.

Thanks
-Cody
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