E-COM was a specialized service by the U.S. Postal System that facilitated the delivery of computer-generated messages as first-class mail, combining electronic transmission and physical delivery.
First-Class Mail is a class of mail service that ensures rapid handling, delivery, free forwarding, and is not subject to opening for postal inspection. This service is generally used for sending letters, postcards, bills, and personal correspondence.
Nonstandard mail refers to first-class or single-piece third-class mail that weighs less than one ounce but exceeds established dimensions. Such mail incurs an additional charge.
The charge incurred per individual piece of mail, distinct from distance-based charges. For example, mailing a first-class letter incurs the same cost regardless of the destination within the country.
