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Why does the Unix From line get mysteriously munged when I send to an alias?

April 26, 2017Alias line munged mysteriously send Unix

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Why does the Unix From line get mysteriously munged when I send to an alias?

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“It’s not a bug, it’s a feature.” This happens when you have an owner-list alias and you send to list. V8 propagates the owner information into the SMTP envelope sender field (which appears as the Unix From line [sometimes incorrectly referred to as the From-space “header”] on Unix mail or as the Return-Path: header) so that downstream errors are properly returned to the mailing list owner instead of to the sender.