A domani in una mail
Here's a possible translation:
"A domani" is Italian for "tomorrow".
So, if you want to say "see you tomorrow" in a mail, you could write:
"A domani, arrivederci!"
Which translates to:
"See you tomorrow!"
Or, if you want to be more formal, you could write:
"A domani, spero di vederti presto!"
Which translates to:
"See you tomorrow, I hope to see you soon!"
Let me know if you need any further assistance!