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Using Return-Path email address in MAIL FROM instead of a header in S…
…mtpTransport. The Return-Path header should not be present on the SMTP transaction, this header is set by the time of final delivery. Quote RFC2821: > When the delivery SMTP server makes the "final delivery" of a message, it inserts a return-path line at the beginning of the mail data. This use of return-path is required; mail systems MUST support it. The return-path line preserves the information in the from the MAIL command.
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