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"I can't believe you wrote that in an email."
It's bad enough when your friend or colleague tells you that.
But what happens when your email is tweeted, passed around online, and ridiculed by some of the nastier people you've never met?
Perhaps you wrote something a little unkind, or impolitic, or snide. Or, worse yet, you wrote something that reveals that you need to review your moral bearings in the world -- it was harmful, crass, prejudiced or offensive.