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Is it mandatory to include a return address when mailing a letter through USPS?
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It's always a good idea to put the return address on the envelope, that way if the envelope is undeliverable it can be returned to you. But, no you don't have to put one on.
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If I send a letter, and don't want to include my return address I sometimes use the address to where I am sending the letter as the return address.
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