Variable envelope return path (VERP) is a technique used by some electronic mailing list software to enable automatic detection and removal of undeliverable e-mail addresses. It works by using a different return path (also called "envelope sender") for each recipient of a message.
Read more about Variable Envelope Return Path: Motivation, How VERP Solves The Bounce Handling Problem, Origin, Example, Software That Supports VERP, Disadvantages
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—Joseph Addison (1672–1719)
“... all my letters are read. I like that. I usually put something in there that I would like the staff to see. If some of the staff are lazy and choose not to read the mail, I usually write on the envelope “Legal Mail.” This way it will surely be read. It’s important that we educate everybody as we go along.”
—Jean Gump, U.S. pacifist. As quoted in The Great Divide, book 2, section 10, by Studs Terkel (1988)
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—James A. Garfield (1831–1881)
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—Thomas Mann (1875–1955)