[Exim] RFC number for sender verify

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Author: Michael Jakscht
Date:  
To: exim-users
Subject: [Exim] RFC number for sender verify
Hi,

which RFC is involved in the function of sender verify?
In detail I mean in what RFC is it stated that the remote SMTP
server should accept a MAIL FROM:<> ?
So to say a bounce message??
Couldn't find this RFC number in the spec in or around
chapter 37.10...

Thanx,

Michael