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Getting timeout NDRs when sending to forwarded contacts

Posted on 2010-01-11
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Last Modified: 2012-05-08
We have about 150 new employees (transferred from a new child company) set up in the AD with their email addresses forwarding to contacts that contain their ChildCompany.com email addresses.  We have many other contacts forwarding to other domains.  Many, or most, of the emails sent to ChildCompany users generate an undeliverable response with this:
        Could not deliver the message in the time limit specified.  Please retry or contact your administrator.
            <ParentCompany.com #4.4.7>
Users forwarding to other domains do not do this.  I called the ChildCompany last week to have ParentCompany.com put on their white list.  Sometimes these emails are received by the recipient, sometimes they are not.  The problem is most noticeable when sending to a distribution list but also occurs when sending to individual users. here is the top few rows of a test email I sent to the  distribution group:
Your message did not reach some or all of the intended recipients.

      Subject:      TEST - again
      Sent:      1/4/2010 5:53 PM

The following recipient(s) cannot be reached:

      User on 1/6/2010 6:03 PM
            Could not deliver the message in the time limit specified.  Please retry or contact your administrator.
            <ParentCompany.com #4.4.7>

      User on 1/6/2010 6:03 PM
            Could not deliver the message in the time limit specified.  Please retry or contact your administrator.
            <ParentCompany.com #4.4.7>

     User on 1/6/2010 6:03 PM
            Could not deliver the message in the time limit specified.  Please retry or contact your administrator.
            <ParentCompany.com #4.4.7>
 I can provide an SMTP log if needed.

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Question by:tonyPerry
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2 Comments
 
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Expert Comment

by:Jamie McKillop
ID: 26440703
Hello,

First, I would check DNS resolution. Make sure childcompany.com has MX records and you can resolve those MX records properly. If DNS is fine, I would try sending an email to their MX records from your Exchange server through a telnet session. Make sre you test all MX records.

http://www.yuki-onna.co.uk/email/smtp.html

JJ
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Accepted Solution

by:
tonyPerry earned 0 total points
ID: 26583588
It turns out the child company's servers where behind a PIX firewall with MailGuard enabled. Once this was reconfigured the problem was solved.
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