Hi OP,
Just for the sake of doubt, I have received the exact same email on the same day with the same balance figure.
I believe the scammers are just sending phishing emails to leaked addresses they have in their possession. Just to ask, did you have any bittrex account before
they ceased operation, because i am sure the scammers do not even know if the
personpersons they are sending emails had any account on bittrex or not, they are just throwing their net into the river, lol.