Message Tracking in Exchange 2010 Using PowerShell

Get-MessageTrackingLog -Server Mailbox01 -Start "03/13/2013 09:00:00" -End "03/15/2013 17:00:00" -Sender "john@contoso.com"

$Temp = Search-MessageTrackingReport -Identity "David Jones" -Recipients "wendy@contoso.com"

$Temp | %{ Get-MessageTrackingReport -Identity $_.MessageTrackingReportId -BypassDelegateChecking }

http://www.mikepfeiffer.net/2012/01/generating-delivery-reports-and-tracking-messages-from-powershell/