Caller Service —An optional delivery service provided for a fee at all Post Offices to customers with large volumes of mail, to customers needing multiple separations, and to customers who need a Post Office box number address when no Post Office boxes are available.
Carrier Route —The addresses to which a carrier delivers mail. In common usage, carrier route includes city routes, rural routes, highway contract routes, Post Office box sections, and general delivery units.
Carrier Route File —The official listing of all city and noncity delivery Post Offices, available to mailers in a standardized format. It contains schemes for city routes, rural routes, highway contract routes, Post Office box sections, and general delivery units. The data is formatted by ZIP Code, street name, and street number range.
Carrier Route Presort Mail —Mail sorted by carrier route to qualify for discounted postage. The mail requires no primary or secondary distribution. The term is a general descriptor of the available prices for this type of preparation, which includes Carrier Route Standard Mail, carrier route Periodicals, and carrier route Bound Printed Matter.
Centralized Postage Payment System (CPP) —A postage payment system administered by the Pricing and Classification Service Center that allows publishers of authorized Periodicals publications entered at three or more Post Offices to pay postage at a single postal facility rather than through individual accounts maintained at each entry Post Office.
Certified Mail —A service that provides the sender with a mailing receipt. A delivery record is maintained by the USPS. This type of mail must be sent at First-Class Mail or Priority Mail prices. Certified mail may be combined with return receipt service and restricted delivery service.
Classification —The grouping of mailable matter into mail classes and subclasses by price categories, according to content, weight, size, and preparation standards.
Classroom Price —A Periodicals price that is available to an authorized mailer of educational, scientific, or religious publications for scholastic or religious instruction.
Coding Accuracy Support System (CASS) —A service offered to mailers, service bureaus, and software vendors that improves the accuracy of matching to delivery point codes, ZIP+4 codes, 5-digit ZIP Codes, and carrier route codes on mailpieces. CASS provides a common platform to measure the quality of address matching software and to diagnose and correct software problems. An Overview of the CASS Program and list of CASS certified vendors are available on RIBBS.gov.
Collect On Delivery (COD) —A service for mailers who need to mail an article for which they have not received payment. The amount due the sender is collected from the addressee and the USPS returns the amount due to the sender.
Combined Mailing —A mailing in which individually addressed mailpieces are merged and sorted together, usually using two or more postage payment methods.
Commercial Mail Receiving Agency (CMRA) —A private business that acts as the mail receiving agent for specific clients by providing a delivery address and other services.
Commingle —To integrate dissimilar mail (such as subscriber and nonsubscriber copies or machinable and irregular parcels) into the same mailing.
Computer-Readable Media —A DVD, CD (compact disk), and CD-ROM are mailable at single-piece and discount prices based on the packaging or mailer and contents. For additional information, contact yourBusiness Mail Entry office.
Computerized Forwarding System (CFS) —A centralized, computerized address label-generating operation that performs address correction and forwards or returns undeliverable-as-addressed mail to customers.
Content Identifier Number (CIN) —A code number on a tray or sack label that represents and identifies the class of mail and presort level.
Cooperative Mailing —A mailing made jointly by one or more organizations authorized to mail at Nonprofit Standard Mail prices at the same Post Office.
Copalletize —To combine and present together on pallets mail from two or more different or separately produced mailstreams.
Courtesy Reply Mail (CRM) —Envelopes or postcards that a mailer provides to its customers to expedite delivery of their responses. The customer affixes the reply postage before mailing.