Increase Message Size Limit in Exchange 2007 sp1 ( For Outlook Users )

By default the message size limit is 10 MB for sending and receiving, what we are going to do is to increase this limit to make it 70 MB.

here what  I’m going to do is for outlook users, (for OWA users will be in different post)

The modifications have to be done on different levels:

  • Organization Level:

The settings here will affect all exchange servers on the organization.

Organization Configuration -> Hub Transport -> Global Settings tab ->  Transport Settings -> Properties -> set Maximum Receive Size and Maximum Send Size



The settings can be modified by command shell as well:

Set-TransportConfig -MaxReceiveSize 70MB -MaxSendSize 70MB

To make sure it was done , use Get-TransportConfig command to see the current configuration :



  • Connector Levels:

we have send and receive connectors :

Send Connector:

we can configure the receive connector by going to :

Organization Configuration -> Hub Transport -> Send Connectors -> select appropriate connector -> Properties -> General tab -> Maximum Message Size (KB) field you need to set.



Note: the modification should be done also on the Front end server if you have Edge server do the same change (in may case i have mail security appliance so i did the modifications there)

To do it by shell :

Get-SendConnector | Set-SendConnector -MaxMessageSize 70mb


Receive Connector:

Server Configuration -> Hub Transport -> select a Hub Transport server -> Receive Connectors -> select a connector -> Properties -> General tab -> Maximum Message Size (KB)




You can do it using shell:

Set-ReceiveConnector “Connector Name” -MaxMessageSize 70mb


  • User Level:

size limits can be set to individual users or groups :

Recipients -> Mailbox -> select mailbox -> properties -> Mail Flow Settings tab -> Message Size Restrictions -> Set Sending Message Size & Receiving Message Size.




The limit on the user level shouldn’t exceed the limit on the organization level, but for internal emails no problem for exceeding that limit because the email will not reach to that level.

To do it in power Shell:

Set-Mailbox “User Name” -MaxSendSize 70mb -MaxReceiveSize 70mb



  • Outlook Level

By default outlook is not allowing to attach more than 20MB, so to change this setting we have to modify the register:

  1. Start –> Run –> RegEdit –>
  2. HKEY_CURRENT_USER\­Software\­Microsoft\­Office\­15.0\­Outlook\­\Preferences.
  3. Double-click the MaximumAttachmentSize value.
  4. If you cannot see MaximumAttachmentSize:
  5. Select Edit | New | DWORD Value from the menu.
  6. Enter “MaximumAttachmentSize” (not including the quotation marks).
  7. Press Enter.
  8. Now double-click the MaximumAttachmentSize value you just created.
  9. Enter the desired attachment size limit in KB under Value Data:.
  10. To set a size limit of 70 MB, use “71680 “.

click ok and restart outlook.









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