A similar approach to junk mail: I return pre-paid return envelopes filled with junk mail from other companies. I’ll take the credit card ad from Citibank, the special offer from the local rug cleaner and the discount coupon from Pizza Hut, then send it all out to American Express. After all, the USPS is always complaining that email has cut into their mail volume. And, if nothing else, it probably brightens the day of American Express’s $4.50/hour mailroom sorter.