Intel Spies & Anonymous Messages

I'm pretty sure you can see it but it'll say anonymous. If we can get one of the mods to answer you that will be best since they probably know the answer.

You can sometimes piece that information together.

With spies on both ends you might get one spy report that lists:

Sent by Person A: Go North

and

Recieved by Person B: Go North

which would let you know both the sender and recipient of the message if it was not otherwise obvious. In my experience such information is rarely complete enough to paint this picture.