Hi > Thank you so much for pointing this out! > The original exim configuration/installation was done by a third party vendor > so again I made the mistake of assuming they knew what they were doing. > For some reason they did set the return-path to <> but not the "From" > address. I've changed this and hopefully the mail loop will not happen again.
This was probably meant and is fine. The address given by RCPT TO is also known as "envelope-from", which needs to be empty. If some server replied to such a mail with anything, there is something wrong on that side... Regards, Steffen
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