Inpect and block outgoing emails.

Question

Hello, I am new in Exchange Server Development. My task is to create TransportAgent that can inspect and sometimes block outgoing emails. It is important for me to inspect and block internal emails too(not only emails going out of organization). I need to
support Exchange 2010, 2013.
Thanks in advance,
Vitaly

Answer 1

As others have mentioned probably what you want can be done via Transport Rules.
However if you have some form of content that can't be caught with Rules and you want to use a Transport Agent then.
>> It is important for me to inspect and block internal emails too(not only emails going out of organization). I need to support Exchange 2010, 2013.
  Then using a routing agent
http://msdn.microsoft.com/en-us/library/office/aa563310(v=exchg.150).aspx (the OnSubmittedMessage is probably the most appropriate) and
http://msdn.microsoft.com/en-us/library/office/aa579261(v=exchg.150).aspx#Namespaces is the way to go as this will catch both Internal and External email. If you want to write one agent that will work on both 2010 and 2013 then you want compile with the
2010 binaries and then use the
http://technet.microsoft.com/en-us/library/jj591524(v=exchg.150).aspx on 2013 (or just compile a different version for 2010 and 2013).
Cheers
Glen