I've tried to run the following commands but neither work and I'm not sure how I should setup the query. I tried to find a full list of available search strings but couldn't locate one online or using help.
I did find the list here (http://technet.microsoft.com/en-us/library/bb232132.aspx#AQS) but it doesn't include the search queries I am looking for (based on the fact that it doesn't even list "Received:" which I know is an option because I use it all the time.
Search-Mailbox -Identity -SearchQuery 'Received:' 'To:' -LogLevel Full –DeleteContent
Search-Mailbox -Identity -SearchQuery 'Received:' 'Recipient:' -LogLevel Full –DeleteContent
Thanks in advance!