Many clients today want to be able to send and/or receive messages with large attachments. By default SBS has built-in limits of 10 MB for both. To keep this simple and short I will not go into into practical limits or all the detailed options available. I do however recommend reading the link below, from which the information was gathered to get a better understanding of all limits and parameters:
Note: 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 end of the article .
To raise the current default limit from 10 MB to 25 MB (as an example) cut and past the following 3 lines, one by one, into the EMS (Exchange Management Shell) located under All Programs / Microsoft Exchange Server 20xx. You need to substitute your SBS server name for ServerName.
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Set-TransportConfig –MaxSendSize 25MB –MaxReceiveSize 25MB
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Set-ReceiveConnector “Windows SBS Internet Receive ServerName” –MaxMessageSize 25MB
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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
LAN-Tech Network Management 
Comments on: "Quickie: changing message size limits on SBS std 2008 and 2011" (6)
Thank you. All the other solutions were big, long, and not helpful. i found my only problem was the
Set-ReceiveConnector “Windows SBS Internet Receive ServerName” –MaxMessageSize 25MB
I changed that and its working good now.
Perfect, I second the previous comment. You distilled the task into exactly what was necessary to get the job done. Thanks! I also changed the fax/sharepoint connector to 25 MB while I was there.
You, sir, are great. A simple article, straight to the point and an easy solution.
Really appreciate you sharing this post.Thanks Again. Really Great.
[…] I’ve got the full dumps of the Transports available if needed (Get-TransportConfig, Get-ReceiveConnector "External Email" | Format-List, Get-SendConnector "SmartHost Connector" | Format-List, Get-ADSiteLink, and Get-mailbox | ft name, MaxSendSize, MaxReceiveSize), but here are the commands and summary reports taken from this LAN-Tech article: […]
Thanks great posst