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Email users today want to be able to send and/or receive messages with large attachments. By default Windows Small Business Server has built-in limits of 10 MB for both, shown below is a quick method to increase these limits.

This assumes a default SBS 2008/2010 environment, not an Exchange standalone (non-SBS) configuration and you have not edited the default send/receive connectors. If in doubt you can verify the connector names with the commands at the bottom.

To raise the current default limit from 10 MB to 25 MB (as an example) cut and paste the following 3 lines, one by one, into the Exchange Management Shell located under All Programs / Microsoft Exchange Server 20xx. You need to substitute your SBS server name for ServerName.

1. Set-TransportConfig –MaxSendSize 25MB –MaxReceiveSize 25MB
2. Set-ReceiveConnector “Windows SBS Internet Receive ServerName” –MaxMessageSize 25MB
3. Set-SendConnector “Windows SBS Internet Send ServerName” –MaxMessageSize 25MB

Should you wish to review the current settings or connector names you can use the following commands:

Get-TransportConfig | ft name, MaxSendSize, MaxReceiveSize

Get-ReceiveConnector | ft name, MaxMessageSize

Get-SendConnector | ft name, MaxMessageSize
 
Get-mailbox | ft name, MaxSendSize, MaxReceiveSize