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Variable envelope return path
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<p> Variable envelope return path (VERP) is a technique used by some <a href="/facts/Electronic_mailing_list/JfLtS62I">electronic mailing list</a> software to enable automatic detection and removal of undeliverable <a href="/facts/E-mail_address/srdpG6am">e-mail addresses</a>. It works by using a different <a href="/facts/Return_path/mngvEe6V">return path</a> (also called "envelope sender") for each recipient of a message. </p>