Can I Call Someone Who Sent Back Direct Mail Without a Phone Number List? 

The Federal government protects consumers from getting unsolicited mail. It makes sure to meet the requirements of federal mail laws and prosecutes mailers who violate them. However, sometimes mailers do not follow these laws, and it can be tricky to trace the mailer. In these cases, you can use an online reverse phone lookup service to find the phone number. The process is easy and will take no more than a few minutes.

(Planning to send a letter but don’t know how much it costs? Click here to check the direct mail price.)

The federal government protects you from unwanted mail 

The US federal government has created several laws to protect citizens from unwanted mail. These laws require clear identification of commercial email and provide consumers with an opt-out option. These laws are enforced by the Federal Trade Commission. These laws also help to prevent sexually explicit materials from appearing in the mail. They can also protect you from telemarketers who use your personal information to send you unsolicited messages.