It’s still professional but a bit more informal than “Best regards” or “Sincerely.” This works well for colleagues you know well or when you’re wishing someone success on a project.

The warm and fuzzies: Best wishes, All best, Kind regards, Warm regards etc “The ... the formal approach might be the way to go. “Yours sincerely remains a solid way to end an email or letter ...

Another short hand, no frills sign off for the busy businessperson is ‘br’, meaning ‘best regards’. The problem with this option is that it can just read as if you’re rather cold.