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Re:Sincerely, Me: What Our Email Sign-offs Say About Us by jgrahamc on Wednesday June 09, 2010 @05:26AM (#1416600)
I always say:

Cheers, John.

It's meant to be professional and friendly at the same time. I hope it says that I'm cheerful and approachable.

Re:Sincerely, Me: What Our Email Sign-offs Say About Us by spiky_simon on Wednesday June 09, 2010 @06:06AM (#1416632)
I use "Cheers" too. "regards" is too formal. I quite like "All the best" as well.