Which account did msg come from?

I received a message from Sally and have no idea which account she sent it from.

In her contact info, she has three known addresses: sally@mars.com, sally@venus.com, and sally@earth.com

When I tap on Sally's name in the From: field, her contact info opens and sally@earth.com is blue in color while the

other addresses are gray.

DId her message originate from the blue address?