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MAILER’S GLOSSARY
3-Digit, 5-Digit Automation — Mail is presorted by the first 3 digits or 5 digits of
recipient zip codes.
AADC (Automated Area Distribution Center) — A USPS distribution center that
scans and processes automation-compatible mail.
Automation — Mail class for mail that can be scanned and processed by USPS
automation equipment. (See Machinable below.)
Carrier Route Presort Mail — Discounted mail sorted by carrier routes. (See
Enhanced Carrier Route below.)
CASS (Coding Accuracy Support System) — A USPS electronic service that verifies
the syntax and accuracy of addresses.
Certified Mail — First-Class or Priority Mail that gives the sender proof of delivery.
Commercial Base Pricing (CBP) — Discounted postage pricing offered by USPS
online, PC postage, and some postage meters/software.
Direct Mail — Advertising and promotional mail delivered to potential customers
(e.g. brochures, catalogs, postcards, newsletters and sales letters).
Enhanced Carrier Route (ECR) — A type of Carrier Route Presort Mail (see above)
that is automation compatible and sorted by carrier route sequence.
First-Class Mail (FCM) — A collection of letter, flat, and lightweight parcel
subclasses, typically delivered within 1-3 business days.
Flat — Mail contained in a large, flexible, evenly thick envelope.
Franking Machine — European term for “postage meter.
Indicia — An imprint that represents U.S. postage printed by an authorized postage
meter.
Information Based Indicia (IBI) — An indicia with a square machine-readable
barcode that encodes machine-readable information about the postage.
Intelligent Mail Barcode (IMB) — A horizontal barcode that encodes information
about the mail piece, including addresses and tracking. (Superseded by IMI
below.)
Intelligent Mail Indicia (IMI) — Replacing the IMB standard (above), a horizontal
barcode that encodes more information more securely than IMB.
Intelligent Mail Package Barcode (IMpb) — A horizontal barcode for packages that
encodes information about the sender, recipient, package, and tracking.
Letter — A message to a particular person, written on a mailpiece no larger than
11½”x6⅛”x¼”, typically enclosed in an envelope.
Library Mail — A package service mail class intended for media items (e.g. books,
documents and recordings) sent between educational institutions.
Machinable — Mail that is compatible with USPS automated scanning & processing
equipment. (See Automation above.)
Media Mail — A package service mail class intended for non-promotional media
(e.g. books, documents and recordings).
Metered Mail — Mail with postage applied by an authorized postage meter or
Online/PC postage service. (See Indicia above.)
National Change of Address (NCOA) — A USPS database containing U.S. resident
changes of address. Can be accessed electronically via the National Change of
Address Linkage System to correct addresses before printing them.
Nonprofit Mail — A set of discounted mail rates available to qualifying non-profit
organizations.
Package/Parcel — A mailpiece larger than a letter or flat, typically (but not
necessarily) a box.
Permit Imprint — A postage indicia containing mailing permit number that
represents postage paid in advance from a USPS deposit account for mailings of
at least 200 pieces.
Presorted Mail — A set of postage discounts based on sorting mail prior to handing
off to the post office, usually requiring at least 500 pieces per mailing.
Registered Mail — An extra service intended for very valuable mailpieces. In
addition to proof of mailing and delivery, provides documented chain of custody.
Return Receipt — An extra service that provides sender with proof of delivery,
including recipient signature for items that don’t come with USPS Tracking.
Signature Confirmation — An extra service that requires recipient’s signature,
which is available as a record for the sender.
Standard (Bulk) Mail — A class of commercial mail with postage discount intended
for mailings of at least 200 identical mailpieces (e.g. catalogs, advertising flyers,
newsletters).
Zones — Postal zones are price categories based on origin and destination zip
codes. Prices trend higher with longer distances and more rural origin and/or
destination locations.