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I am seeing the error “no valid sender in message headers: return path is <>” in the reject log. Isn <> a valid return path for error messages?

April 26, 2017Error headers log message path reject Return seeing sender valid

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I am seeing the error “no valid sender in message headers: return path is <>” in the reject log. Isn <> a valid return path for error messages?

1 Answer

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10 Posted

A0808: It is indeed valid. The complaint here is about the contents of the message’s headers, not the return path. This message has been reworded in later versions of Exim. You must have set the headers_sender_verify option. Check the From:, Reply-to: and Sender: headers that were logged with the error. You can use Exim’s -bv option to find out why verification of those addresses failed. Q0809: Let’s say that we want to run a mail server that does not care if you have proper reverse DNS.