NDR sends for some DSN codes but not others RRS feed

  • Question

  • We are using Exchange 2007, with a separate EDGE transport server in a DMZ

    I have discovered that some DSN codes are emailing NDRs to external recipients but not others.  In particular I want to enable a NDR to be sent to external senders for DSN code 5.3.4  (attachment size exceeded).

    But, the NDR is sending for DSN code 5.1.1 (user unknown), for example.

    I even tried to configure a custom message (on EDGE, since the message never reaches our other Exchange server) and restarted the Transport service with no luck:

    [PS] C:\Windows\system32>New-SystemMessage -DsnCode 5.3.4 -Text "Your email is o
    ver the size limit.  Please try resending the email with fewer or smaller attach
    ments." -Internal $False -Language En
    Identity                  Text
    --------                  ----
    en\External\5.3.4         Your email is over the size limit.  Please try resend
                              ing the email with fewer or smaller attachments.

    Any ideas on how to get this specific NDR to send?

    More info:

    Message Tracking(EDGE) FAIL RecipientStatus: 550 5.3.4 ROUTING.SizeLimit; message size exceeds fixed maximum size for route

    Thursday, February 21, 2013 8:11 PM


  • I fixed the issue. Emails were failing because of mismatched  transport rules.
    Tuesday, February 26, 2013 10:55 PM

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