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It depends on the sector. In general, it is always preferable to send a hand-written note by post because the extra mile you put in to express gratitude can give you a competitive advantage in the job decision process. Most people do not send any formal thank-you notes after interviews, so you should always do so. However, I recognize that certain sectors, such as government agencies, labs, and even some academic institutions are difficult to send mail to. In fact, I have mailed cards to professionals in the federal government only to have them get lost in a labyrinthine system of security. So if you think this might be the case with your prospective position, send an email thank-you note. And be sure to send one individually to each person who interviewed you, as opposed to a batch email to a group.