From owner-freebsd-mobile  Wed Nov 14 19:37:29 2001
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From: Jim Durham <durham@w2xo.pgh.pa.us>
To: "Louis A. Mamakos" <louie@TransSys.COM>, walton@digger.net
Subject: Re: Sending mail to FreeBSD.org (was: FreeBSD lockup accessing serial port on Thinkpad)
Date: Wed, 14 Nov 2001 22:37:03 -0500
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Cc: Greg Lehey <grog@FreeBSD.ORG>, mobile@FreeBSD.ORG
References: <20011114060923.89146.qmail@aerre.pair.com> <200111141433.fAEEX2E71690@whizzo.transsys.com>
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On Wednesday 14 November 2001 09:33 am, Louis A. Mamakos wrote:
> > I send to mail.pacbell.net (aka mta7.pltn13.pbi.net,
> > mta5.snfc21.pbi.net, mta6.snfc21.pbi.net). From the look of the bounce
> > messages, they are leaving off the hostname and sending just the domain
> > (pltn13.pbi.net or snfc21.pbi.net). Which is good and proper:
> >
> >
> >   RFC 821:  "HELO <SP> <domain> <CRLF>"
> > (Though it goes on to contradict itself with "The argument field
> > contains the host name of the sender-SMTP", ALL examples given use a
> > domain name.)
> >
> > RFC 1123: "The sender-SMTP MUST ensure that the <domain> parameter
> > in a HELO command is a valid principal host domain name for the client
> > host. [...] 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."
> >
> > RFC 2821: "The argument field contains the fully-qualified domain name
> > of the SMTP client if one is available."
> >
> > ...and others.
>
> No, you mis-interpret the specification.  <domain> refers to a domain name,
> e.g., the fully qualified domain name of the host.  It's not what might
> othewise be called the "sub-domain".  Unless pltn13.pbi.net resolves to
> something useful (which apparently it does not), this isn't going to be
> accepted. The HELO command is supposed to identify the actual end-system
> host submitting the message to produce accurate adivisory information and
> proper Received: header lines.  It's not intended to be some generic domain
> identifier.
>
However, 1123 *does* say that "the receiver must not refuse to accept a 
message", etc, etc. I noticed that hub.freebsd.org is postfix. Sendmail would
accept the message, but probably append a header saying "Possibly Forged" or 
something of that sort. It sounds like that is the intent of the RFC.

-Jim

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