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I am not a lawyer.
But if you generated bitcoins and then sold them I'd think you'd only done something illegal when you fail to declare that income on your income tax return. Just like if you grew tomatoes in your back yard and sold them to somebody. You aren't likely to get into any trouble until you make a lot of money on tomatoes and then fail to report that income to the IRS (or you get shut down for farming in a residential zone or something).
I think that applies to what madhatter is doing (taking payment for bitcoins through the mail). But again, I am not a lawyer.