ActiveSync Headers

Hi,

Wonder if anyone can help.  I am looking to route all traffic sent from an ActiveSync device to a separate Send Connector.  I have a transport agent which can look inside various headers etc.  Therefore my question is how can I determine from the headers if a mail was sent from an ActiveSync device?

Looking at the headers I receive when I send using ActiveSync, there is nothing obvious/consistent which I could route upon?

Any help much appreciated.

Regards

James