I like "cheers" for informal email or for people I've had a longer professional relationship with. I think its too intimate/informal for new acquaintances or n

I like "cheers" for informal email or for people I've had a longer professional relationship with. I think its too intimate/informal for new acquaintances or new customers, so "regards" gets used for that. I think its a better sign off for conveying deference and respect, without sounding like Mr Darcy with "yours sincerely". That one I reserve for lawyers .