OT: Email signing

[Arthur Pemberton <pemboa gmail com>]

Hey guys, this is somewhat offtopic, but I can't think of a better place to ask . . .

Could someone briefly fill me in on the if, why and how of email
signing (I do not mean signatures). I am sure I can google the how, but
I would like opions and experiences.

Thank you.

-- 
As a boy I jumped through Windows, as a man I play with Penguins.