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Exim, by default, sends bounce messages using MAIL FROM:<>, which my upstream SMTP host rejects. I've seen options to add an AUTH= address to the MAIL FROM line, or to change the From: address on a bounce, but not to change the actual address in the MAIL FROM line; does this option exist, or any way to achieve that effect?

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Bounces are supposed to come from <>. Perhaps you need to convince your upstream host to stop doing things wrong. rfc-ignorant.org/policy-dsn.php –  Zoredache Apr 19 '11 at 21:02
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Or you need to reject bogus messages during the SMTP delivery and then it will not be an issue. –  Zoredache Apr 19 '11 at 21:04
    
Thanks! Didn't realize that. –  npt Apr 20 '11 at 22:13
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1 Answer

up vote 1 down vote accepted

An empty MAIL FROM:<> is perfectly legitimate, and the upstream SMTP host is the thing that needs fixing.

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