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Organisational level: and/or Receive connector level. We recommend that it is best to do both.


Organisational Level


The message size limits on the organization level can be set through the Exchange Management Console via Organization Configuration > Hub Transport > Global Settings by opening the Properties of Transport Settings:



  Of course, you can also view the settings using the Exchange Management Shell using Get-TransportConfig

 

 


 As you can see, the default value in Exchange 2010 is 10240 (10 MB) for both receive as well as send message sizes. If you require a higher value, for example to enable people to send and receive larger attachments, you can use the EMC or Set-TransportConfig:


Set-TransportConfig –MaxReceiveSize 25MB –MaxSendSize 25MB


Then at a Receive connector level


The message size limits on a send connector can be set through the Exchange Management Console via Server Configuration > Hub Transport by opening the Properties of the Receive Connector in the Receive Connectors panel:



You can also use Get-ReceiveConnector:



The default maximum receiving message size for receiving messages for Exchange 2007/2010 receive connectors is 10 MB. If you want to be able to receive larger messages over this receive connector, you can use the EMC or Set-ReceiveConnector:


Set-ReceiveConnector –Identity “MAIL1\Default MAIL1” –MaxMessageSize 25MB