Ned Freed writes:
> Gmail: Webmail does not disclose originating client IP, apparently using
> invalid Received: field to avoid doing so.
Invalid, how so?
I looked at one now, and the oldest Received contained "by", "with" and
"id" received-tokens. 5322 says all received-tokens are optional, 5321 says
that SMTP servers MUST add a "from" received-token, but that Received
wasn't written by an SMTP server and 5321 3.7.2 explicitly allows other
software to be different. 2476 says nothing.
What am I overlooking?
In my testing I saw the following sorts of fields:
Received: by lffz202 with SMTP id z202so35306770lff.3 for
<ned(_dot_)freed(_at_)mrochek(_dot_)com>; Wed, 21 Oct 2015 22:32:47 -0700 (PDT)
Received: by pasz6 with SMTP id z6so88255027pas.2 for
Thu, 22 Oct 2015 07:30:31 -0700 (PDT)
That sure looks like an SMTP server to me so RFC 5321 applies, and I don't see
a "from" clause in there.
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