Unfortunately the Exchange Management Console does not allow use of wildcard values for things like senders and recipients. These need to be specific user or list of users. However you can search these logs for wildcard values using the Exchange Management Shell.

Here are two examples to search for any user at example.com. These will output the results to a text file for easier viewing. Make sure to update the date ranges and domain name as needed.

Search for messages sent TO any users at example.com:

Get-MessageTrackingLog -ResultSize Unlimited -Start "5/1/2011" -End "5/12/2011" | where{$_.recipients -like "*@example.com"} | select-object Timestamp,SourceContext,Source,EventId,MessageSubject,Sender,{$_.Recipients} | export-csv C:\ExchangeLogResults.txt

Search for messages sent FROM users at example.com:

Get-MessageTrackingLog -ResultSize Unlimited -Start "5/1/2011" -End "5/12/2011" | where{$_.sender -like "*@example.com"} | select-object Timestamp,SourceContext,Source,EventId,MessageSubject,Sender,{$_.Recipients} | export-csv C:\ExchangeLogResults.txt

This information applies to Exchange 2003, 2007, and 2010.

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