Mail which is pre-addresses and pre-barcoded to facilitate return to the distributor of it. Courtesy reply mail does not carry prepaid postage. (USPS)

Consists of pre-addressed postcards or envelopes provided by mailers to their customers, both to expedite their responses and to provide more accurate delivery.

A preaddressed return envelope provided by business mailers to their customers. The customer still pays the postage.

A preprinted return envelope or card provided as a courtesy to consumers. Postage is paid by the consumers responding to the original mailing.

Envelopes or postcards that a mailer provides to its customers to expedite delivery of their responses. The customer affixes the reply postage before mailing.

A preprinted return envelope or card provided as a courtesy to consumers. Customers responding to the original mailing pay the return postage.

Courtesy reply mail, or CRM, is a type of mail in which a business sends pre-printed, self-addressed envelopes or postcards to customers, who then affix postage stamps to the envelopes or postcards and mail them back to the business.http://pe.usps.gov/text/dmm200/additional3.htm "Encouraging Customers to Reply", from the USPS Alternatively, the business can disseminate the envelopes or postcards with stamps already affixed, similarly to metered reply mail.