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  • Email with large attachments bounceback with error

    Hi,
    The title of the post probably seems like an easy solution, but I've checked high and low.
    We run Exchange 2k3 SP2
    We have a global setting in place that restricts email size to 10MB
    But we have some staff members that are required to send and receive larger emails, up to 15MB

    So for those people, I've gone into the Delivery Restrictions of their user properties in AD and manually increased their send and receive limit to 22MB to allow for overhead on attachments.

    So to confirm settings I had a read of these:
    petri[dot]co[dot]il/setting_size_limits_for_messages.htm
    support[dot]microsoft[dot]com/kb/322679
    nogeekleftbehind[dot]com/2007/07/19/message-is-larger-than-the-current-system-limit/

    So then if I send an email with a 13MB zip file I get the following bouceback:
    This message is larger than the current system limit or the recipient's mailbox is full. Create a shorter message body or remove attachments and try sending it again.
    <Domain #5.2.3>

    But If I bring the zip file down under the 10MB mark, off it goes.
    But the other twist is, if I send the email internally to another user that can accept email up to 15MB, it goes through.

    So based on the above articles that I read, that would suggest that the size restriction would live in the "SmallBusiness SMTP connector"
    But when I check the properties, for the connector, under the Content Restrictions tab, the option for Allowed sizes is unticked so there's no restrictions.

    Any ideas where I go to from here?
    Am I doing the restrictions wrong? I thought I could make a users send and receive limit higher than the global settings.

    Cheers,
    Trent

  • #2
    Re: Email with large attachments bounceback with error

    Personally I have always worked on the basis of restrict down, not open up.
    Therefore any global settings would be the higher limit and then users would have a lower limit applied to them.

    Also note that if you have a 15mb limit, then the actual limit is going be more like 12mb, as there is encoding overhead involved as well. If you want to allow users to send 15mb email then you will probably need a 20mb limit.

    Simon.
    --
    Simon Butler
    Exchange MVP

    Blog: http://blog.sembee.co.uk/
    More Exchange Content: http://exchange.sembee.info/
    Exchange Resources List: http://exbpa.com/
    In the UK? Hire me: http://www.sembee.co.uk/

    Sembee is a registered trademark, used here with permission.

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    • #3
      Re: Email with large attachments bounceback with error

      How long after you changed the limit did you send the test message? Message size limits is a setting that Exchange caches in it's dsaccess cache. By default the cache lifetime is 2 hours (but can be modified in the registry). You can force the setting to be "applied" immediately by stopping and starting the Microsoft Exchange Information Store service on the Exchange server.

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      • #4
        Re: Email with large attachments bounceback with error

        Thanks for the replies.
        Simon,
        The MS KB article seemed to suggest restrict down in it's example.
        But just didn't seem suitable as we are looking at 5-10 people needing 15MB as opposed to 200+ restricted @ 10MB.
        I'm not sure if there is an easy way to push out 10MB user restrictions to all users and globally restrict to 15MB with Exch 2k3?
        The AD addin doesn't see to offer a mass way to change this.
        As I mentioned I had set the users limit to 22MB to allow for overhead (I had read to allow for 30% more for overhead).

        In past experiences I hadn't had problems with setting the user limit higher than the global limit.

        Joe,
        The users policy had been applied for well over a day, probably closer to a week. As a test I had set the user policy to 30MB as well.

        It's just unusual that the restriction seems to be with external users but not internally for those that have larger user limits.
        Last edited by Trentl; 8th October 2012, 02:35. Reason: added text and spellcheck

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        • #5
          Re: Email with large attachments bounceback with error

          admodify should allow you to make the change in bulk.

          Simon.
          --
          Simon Butler
          Exchange MVP

          Blog: http://blog.sembee.co.uk/
          More Exchange Content: http://exchange.sembee.info/
          Exchange Resources List: http://exbpa.com/
          In the UK? Hire me: http://www.sembee.co.uk/

          Sembee is a registered trademark, used here with permission.

          Comment


          • #6
            Re: Email with large attachments bounceback with error

            Thanks for the tip.
            I've downloaded ADModify if I need to make the change.
            As a test I'm going to give all users 15mb (22mb) limit globally and test to see if it is an issue with the direction I'm applying the restrictions.
            I'll let you know what my testing shows.

            Trent

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