Which address was the TXT message in iMessage sent to?

I have a google voice phone number and a Verizon phone number. (I'm out of the country a lot for extended periods so I have the google voice number so that people can always find me somehow)

How can I tell if the message sent to me was to the google voice number or the verizon number. And then if we consider iMessage which email address was it sent to since I have several of them.