Does the Post Office really sell data from change of address forms to junk mailers (a.k.a. direct marketers)?

Question

I did not file one the last time I moved, and my junk mail is reduced to almost zero (after 4 months).

Answer 1

No, the USPS does not sell your information to anyone. Although I can't say the same about your credit card and utility companies. The USPS on the hand is restricted by the Privacy Act.