E-COM, short for Electronic Computer Originated Mail, was a hybrid mail process used from 1982 to 1985 by the U.S. Postal Service to print electronically originated mail, and deliver it in envelopes to customers within two days of transmission. The E-COM service allowed customers to transmit messages of up to two pages from their own computers, via telecommunication lines, to one or more of 25 serving post offices (SPOs) located in the following cities: Atlanta, Boston, Charlotte, Chicago, Cincinnati, Dallas, Denver, Detroit, Kansas City, Los Angeles, Milwaukee, Minneapolis, Nashville, New Orleans, New York, Orlando, Philadelphia, Phoenix, Pittsburgh, Richmond, St. Louis, San Antonio, San Francisco, Seattle, and Washington, DC. After an electronic message was received as a SPO, it was processed and sorted by ZIP Code, then printed on letter-size bond paper, folded, and sealed in an envelope printed with a blue E-COM logo. In order to eligible for the service, customers were required to send a minimum of 200 messages per transmission.