Do domain transfers get authorized by snail mail or email?

[deckeda]

Got it, thanks. And I just re-read the email I got from the host taking this domain over.

Mail will come from ENOM, you must confirm transfer process, if letter will not come withing 24 hours, write to us again.

Looks like a physical letter was sent, so I've emailed the last site admin so they'll be on the lookout too.