A thank you sent via email is very appropriate, especially if that is the mode of communication being used between you and the company/organization.  However, an email should not take the place of a hand written thank you, but should be in addition to.

A helpful tip is to have your thank you card and pre-stamped and addressed envelope with you in the car.  Once you leave the interview, write your thank you, and put it in the mail on your way home.  This way you are being prompt and eliminates the possibility of forgetting.

Need a thank you card?  We’ve got you covered.  Stop by the Career Office to pick one up.