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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“There is not so variable a thing in nature as a lady’s head-dress.”
—Joseph Addison (1672–1719)
“Life is not a series of gig lamps symmetrically arranged; life is a luminous halo, a semi-transparent envelope surrounding us from the beginning of consciousness to the end.”
—Virginia Woolf (1882–1941)
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—Samuel Johnson (1709–1784)
“Old and fat, I waddle, gasping, up the beckoning path of lust.”
—Mason Cooley (b. 1927)