Raffle Tickets —For an overview of the eligibility of lottery advertisements by authorized nonprofit organizations, see Customer Support Ruling 307.

 

Registered Mail —Provides the most secure service offered by the USPS. The sender receives a receipt at the time of mailing, and a delivery record is maintained by the USPS. This service also provides optional indemnity in case of loss or damage. Compare with Certified Mail and insured mail.

 

Reply Mail (MRM) —A preprinted return envelope, card, or label provided by a meter license holder as a courtesy to customers on which the postage is prepaid with a meter stamp. These pieces must have a specific address and format. Compare to Business Reply Mail and Courtesy Reply Mail.

 

Restricted Delivery —A supplemental mail service that generally limits who may receive an item. This service is available for a fee when used with Certified Mail, collect on delivery, insured mail, and Registered Mail.

 

Restricted Matter —Any item on which certain mailing restrictions have been imposed for legal reasons other than risk of harm to persons or property involved in moving the mail and that require specific endorsements and markings. Examples include odd-shaped items in envelopes, motor vehicle master keys, and locksmithing devices as well as odor-producing materials, certain liquids and powders, and battery-powered devices. Compare to hazardous material.

 

Rural Route (RR) —A delivery route served by a rural carrier.