From owner-freebsd-mobile  Wed Nov 14  6:33:11 2001
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From: "Louis A. Mamakos" <louie@TransSys.COM>
Subject: Re: Sending mail to FreeBSD.org (was: FreeBSD lockup accessing serial port on Thinkpad) 
References: <20011114060923.89146.qmail@aerre.pair.com> 
In-reply-to: Your message of "Wed, 14 Nov 2001 01:09:23 EST."
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> 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.

louie





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