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Workaround for mail loop for sympa-request address (#1018)

David Verdin requested to merge github/fork/ikedas/issue-1018 into sympa-6.2

Created by: ikedas

As of Postfix 2.3, Content of Return-Path: pseudo-header field added by pipe(8) for null envelope sender became "MAILER-DAEMON". Empty null_sender option will prevent this behavior. As a workaround, the uppercase "" will be treated as null envelope sender.

This is a workaround for #1018 (closed) .

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