Manish,
I think there might be some confusion. It sounds like you are monitoring Exchange and Ironport for email. In this situation it sounds like you may be using the Prevent functions which I would imagine are not using TAPs for monitoring. If you are looking to monitor traffic in the same manner but at both the points you mentioned, then I would imagine you are using the TAPs. Identifying the TAPs that are sending data though, may simply be a matter of identifying which connection is plugged into which NIC. As long as the NIC is showing packets coming in you should be in good shape. You will also want to check the server configuration page to verify that you have enabled monitoring on the NIC's that are active.
Viewing IP's can potentially help you as well if you know what the IP ranges you should be seeing are. Unfortuantely deciphering IP information gets a little more difficult than looking at the base of the server configuration as I outlined above.