500 - Line Too Long in Exchange 2007

Posted on 2007-08-07
Last Modified: 2012-08-14
Our orginization is currently running Exchange 2007. One of my users is saying they cant get e-mails from a specific sender that is using AOL. They are recieving a "500 - Line Too Long" error.


   ----- The following addresses had permanent fatal errors -----

   ----- Transcript of session follows -----
... while talking to
>>> DATA
<<< 500 Line too long
554 <>... Remote protocol error
Final-Recipient: RFC822;
Action: failed
Status: 5.5.2
Remote-MTA: DNS;
Diagnostic-Code: SMTP; 500 Line too long
Last-Attempt-Date: Mon, 6 Aug 2007 08:45:26 -0400 (EDT)
Received: from


We have a WatchGuard Firewall and Spam appliance sitting in front of the Exchange 2007 server.

Any idea on what is causing this???

Thanks... :)
Question by:fgarufijr
    LVL 32

    Accepted Solution

    I believe that you are using SMTP proxy for the incoming traffic [WSM ver 8.3.1 or higher, if you are using some other version the settings remain same but the location to find item might change], please go to SMTP properties:
    1. Go to Properties tab of your SMTP proxy service.
    2. Under the Proxy drop-down, it should be SMTP-Incoming; click View/Edit Proxy.
    3. Under General, go to General Settings
    4. As the data length is getting error line too long, look at properties:
    Maximum e-mail size
    Maximum e-mail line length

    After changing the value depending on the email which you are receiving and you want to alllow, the email should come in.

    Other option(s), though not recommended, is to configure SMTP for no filtering for that specific email server (if it is business criticial) or not limiting the size enforcements for that server. Removing complete size enforcements for the server from ANY source is not a good idea at all.

    Please implement and update.

    Thank you.


    Author Comment

    Thanks Deepak! :)

    That took care of the problem :)

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