When you get home or before you go to bed the night of your interview, send a thank-you note to each person with whom you met. If you do not have individual email addresses, ask the recruiter to forward your messages, but ideally send a unique thank you note to each person on the panel. Try to personalize it a bit with something you learned about them. Below are a few examples of thank you messages. Send these via email because companies may have decided on their top candidate by the time, they get a mailed thank-you note.