We're currently testing a data loss prevention application that is supposed to alert us when someone sends an outbound Internet email containing an Outlook message item as an attachment (.msg file). Problem is that we're not being alerted. We believe that Exchange is converting the .msg attachment to .txt. When an Outlook user composes an email, attaches an Outlook message item (.msg) and sends it out to the Internet, our packet sniffer (Wireshark, Network Monitor, etc) is seeing the .msg attachment as .txt
My question: With Exchange outbound Internet email, is it behavior by design to convert .msg attachments to .txt ?
This may explain why our data loss prevention application is not alerting us. We run Exchange 2003 and Exchange 2010. We've just starting looking into this and so far have experienced this situation with Outlook 2003/Exchange 2003. Thanks.