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  1. #1
    Lounger
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    Undelivered email

    Our Exchange server 5.5 on a windows 2000 server sp4 was working fine. Monday we began to get the following messages and our email was not delivered to external addresss.

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

    Subject: Test 930 918
    Sent: 09/18/2003 9:22 AM

    The following recipient(s) could not be reached:

    'wmgsmith@excite.com' on 09/18/2003 9:22 AM
    Unable to deliver the message due to a communications failure
    The MTS-ID of the original message is: c=US;a= ;p=cpofnj;l=NTSERVER-030918132155Z-511
    MSEXCH:IMS:ucpanj:UCP:NTSERVER 3902 (000B09AA) Host Unknown

    'wmgsmith@comcast.net' on 09/18/2003 9:22 AM
    Unable to deliver the message due to a communications failure
    The MTS-ID of the original message is: c=US;a= ;p=cpofnj;l=NTSERVER-030918132155Z-511
    MSEXCH:IMS:ucpanj:UCP:NTSERVER 3902 (000B09AA) Host Unknown

    I change the DNS to our DSL suppliers DNS IP and we quit getting the undeliverable messages but the email was still undelivered.

    Changing back to our internal DNS cause the reoccurence of the undeliverable messages.

    Our network has set behind a Linksys Firewall during the entire time.

    We have tried every thing we can think of. <img src=/S/confused.gif border=0 alt=confused width=15 height=20>

    Anyone have any experience with this kind of problem or any suggestions??

  2. #2
    Super Moderator jscher2000's Avatar
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    Re: Undelivered email

    No personal experience, but it seems quite common:

    Google web search (sorry, I can't link with the internal quotes):
    http://www.google.com/search?q="Unable+to+...ilure"+exchange

    Google Usenet search (ditto):
    http://groups.google.com/groups?q="Unable+...ilure"+exchange

  3. #3
    New Lounger
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    Re: Undelivered email

    Does this happen with all domains you are sending to? If not, check into the DNS setup for the problem domains using something like www.dnsreport.com. I don't know about Exchange, but many mail servers will have issues if the receiving domain DNS entries are not correct. One of the more common issues are MX entries that reference CNAME entries. I find this a lot with hosting companies that host virtual domains and don't fully understand how DNS works. Another thing I see often, although there is debate about this, is the reverse DNS entry for the MX doesn't match the A record.

    If any of what I described is found to exist, it can be a real battle getting the receiving end to do anything about it. The usual answer is something like "well, you are the only one having problems sending mail to us". Chances are, you are not the only one and either they don't know it, they don't care or they don't know how to fix it. However, if you do head off telling someone their stuff isn't right, make absolutely sure your stuff is first. This works both ways. Mail servers also don't like to receive mail from domains that have funky DNS setups.

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