U.S. Postal Inspection Service
Criminal Investigations Service Center
Attn: Mail Fraud
433 W. Harrison Street, Room 3255
Chicago, IL 60699-3255
The U.S. Postal Inspection Service (USPIS), which was founded by Benjamin Franklin, is one of the oldest law enforcement agencies in the U.S. Among its many responsibilities, the USPIS enforces the laws regarding illegal or dangerous use of the mail system, and conducts investigations (sometimes in conjunction with other federal agencies, like the FTC) into criminal acts involving the mail, including scams or deceptive ads sent via mail.
The USPIS also invites consumers to file complaints about scams or deceptive ads they’ve received, and allows recipients of erotically arousing or sexually provocative ads to ask the Postal Service to tell the sender to stop sending such mailings.