Top Definition
Email that's so old that by the time you get to it, you might as well just delete it rather than reply.
Steve-O: I got email from Sam looking for that set list.

Spunky: You send it to him?

Steve-O: Naw, by the time I got through the rest of my inbox, he got it from someone else. My inbox is full of stale mail like that.
by AgentMike April 29, 2009
any E-mail that arrives (sometimes again) weeks after it was originally sent, due to very slow servers.
After replying to Karens Email, i realized it arrived today - BUT was sent two weeks ago, Damn Stale Mail!
by Addictive1 June 19, 2006

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