From: Havard.Eidnes@runit.sintef.no
5.2.8 DATA Command: RFC-821 Section 4.1.1
...
* The FROM field SHOULD contain both (1) the name of the
source host as presented in the HELO command and (2) a
domain literal containing the IP address of the source,
determined from the TCP connection.
...
DISCUSSION:
Including both the source host and the IP source address
in the Received: line may provide enough information for
tracking illicit mail sources and eliminate a need to
explicitly verify the HELO parameter.Thus, this is not a new suggestion (RFC 1123 is dated Oct 1989).
You are correct. Good memory! So, how do we enforce a 6 year old RFC?