Figuring out how to sign off on a work email can be ... "Is this a cover letter? Because otherwise, no," says Licht. "Very formal, and could seem cold if it follows more intimate sign-offs ...

A formal letter or email would have a standard greeting ‘Dear Ms. White’ and sign-off ‘Yours sincerely, Nathan Reilly’ whereas an informal letter or email might use a first name ‘Dear ...