Increase Maximum Acceptable Message Size in Exchange Server 2010

On Small Business Server 2011 you receive the following event ID in the event log and messages are not retrieved from a POP3 account using the pop3 connector:

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Log Name: Microsoft-Windows-Small Business Server/Operational

Source: Windows Small Business Server 2011 Standard
Event ID: 210
Task Category: Windows SBS POP3 Connector
Level: Error

One or more messages (1) were left in the ‘xxxxx@xxxxxxx.com.au’ account on the POP3 server ‘xxxxx.xxxxxxx.com.au’ because they are larger than the maximum acceptable message size (the largest message is 11533705 bytes). You can either connect to the POP3 account and retrieve or delete the messages manually, or increase the maximum acceptable message size in Exchange Server.

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To Fix this you will need to open an Exchange Management Shell and run the following:

get-receiveconnector | select identity,maxmessagesize

As you can see this shows a list of receive connectors on your server. In this case they are currently at 20Mb which I’ve found to be adequate. If yours are lower than this you can change the MaxMessageSize with the following:

set-receiveconnector “Windows SBS Fax Sharepoint Receive SERVER1″ -maxmessagesize 20MB

In this case the command did nothing as the connector was already at 20Mb. Change all three connectors to your desired levels.

The command is not available. See the program documentation about how to use this extension.

This error occors sometimes in Outlook 2003 when trying to set the Out of Office Assistant. To fix this:

1. Open Outlook.
2. Click on Help -> About Microsoft Office Outlook.
3. Then click on Disabled Items on the bottom right hand side. Click on “Addin: outex.dll (outex.dll)” and click the enable button.

You can also delete the registry key “HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Outlook\Resiliency” which does the same as the above but the first part is easier to talk customers through.