>There is certainly nothing there
> to override the earlier RFC (which I've forgotten) that
> specifies a similar recommendation but goes on to say that
> the receiver MUST NOT reject the message based on an address
> lookup mismatch for the HELO/EHLO name (obviously written by
> someone who realized that multi-homed servers are common and
> that corporate servers often live behind NAT firewalls and
> don't even know the address that will be used the public side).
>
> --
> Les Mikesell
> les@xxxxxxxxxxxxxxxx
I believe you are referring to RFC 821:
The HELO receiver MAY verify that the HELO parameter really
corresponds to the IP address of the sender. However, the receiver
MUST NOT refuse to accept a message, even if the sender's HELO
command fails verification.
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