Of course, by the time you write the note, mail it, wait for the post office to deliver it to a mailroom where it might sit for a couple of days before sitting in a pile of mail on someone's desk until he or she comes back from a trip....the other applicants may have already sent emails.
Nothing wrong with an email to say thank you. But always, always, say thank you.
Nothing wrong with an email to say thank you. But always, always, say thank you.