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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. – Zoredache Apr 19 '11 at 21:02
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
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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Asuming this is an old issue, please note that this can cause bounces with Amazon SES service. Its exactly this issue which we personally haven't solved as we endep up avoiding exim as forwarder

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