Howto: Configure Send and Receive limits for Exchange 2007 and 2010

There are 3 levels to control the message size limits for sending and receiving emails through a Exchange 2007 or 2010 mail server. Mail transport is controlled by the hub transport role so settings are made on the hub transport role.

Global settings: In Exchange Management Console, on Organization level, Hub Transport, Global Settings tab, select Transport settings properties you can set the Maximum receive size (KB) and Maximum send size (KB) at Transport limits for the whole Organization.

Connector settings, Receive connector: In Exchange Management Console, on Server Configuration level, Hub Transport, select the server and receive connector you want to set the Maximum message size (KB) for. You can set different values for all servers and receive connectors, so be sure you change the settings for the right Hub Transport server and the right receive connector.

Connector settings, Send connector: In Exchange Management Console, on Organization level, Hub Transport, Send Connector tab, you can set the Maximum message size (KB) for your Send connector(s). The setting is organization wide so for all servers if you have multiple send connectors you can make differences for the specific send connectors.

Last possibility is to set it on a User Mailbox: In Exchange Management Console, on Recipient Configuration level, Mailbox, select a User you want to set the limit for, properties, on the tab Mail Flow Settings select Message size restrictions

Posted in Exchange 2007, Exchange 2010, Howto by ronnypot at November 11th, 2010.
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7 Responses to “Howto: Configure Send and Receive limits for Exchange 2007 and 2010”

  1. Francois van der Bank says:


    I went through all the settings, but still my SBS 2011 does not download emails that are larger than 3 MBs; it then also blocks any new incoming emails. The only way around this is to login to my ISP and delete the email, afterwhich the POP3 connector starts working again.
    Do have any suggestions?

  2. Tom Vitucci says:


    Thanks for the instructions above. Very helpful. But…..still not letting the messages go through. We wanted to set a 20MB limit and I made the limits 40MB, but it still gets returned “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

    Tried to set it on a user individually too, but that didn’t work either. Will try to explain our environment as best I can. We’re hosting this for another company. They access their apps through Citrix. The SBS Server and Citrix are at a co-location. The SBS2011 server is connected to a Barracuda Message Archiver. This then goes through our Ironport, but it’s not even hitting the Ironport. Anythoughts or ideas would be appreciated!


    • ronnypot says:


      First thing to clarify is the settings you set on an individually mailbox are only used for internal emails so for external this will nog do a thing.

      Second did you only try this to one user or to multiple, it could be the case that the recipients server is not accepting emails larger than let say 10mb.

      Last what time went by after you changed the values, I have seen it could take some time before the new limits were active.

  3. Joel says:

    Something else to check.

    After much searching, I found the below which gives you the current settings.


    With this information, if you’re running SBS2011, you’ll probably find a connector that is still set to the default size !

    Go back to Server Configuration, Hub Transport and check the Windows SBS Internet Receive connector.

    Problem fixed.

  4. Tech-o-matic says:

    Dont forget: If you want to set the size for an mail enabled public folder you have to configure just more:

    Organization Configuration->Mailbox->Databases->Public Folder Database->Limits->Maximum item size

    (in german translation:
    Org.Konfig->Postfach->Datenbankverwaltung->Public Folder Database->Grenzwerte->Max. Elementgröße

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