Date: Wed, 14 Nov 2001 22:37:03 -0500 From: Jim Durham <durham@w2xo.pgh.pa.us> To: "Louis A. Mamakos" <louie@TransSys.COM>, walton@digger.net Cc: Greg Lehey <grog@FreeBSD.ORG>, mobile@FreeBSD.ORG Subject: Re: Sending mail to FreeBSD.org (was: FreeBSD lockup accessing serial port on Thinkpad) Message-ID: <200111150337.fAF3b4u32892@w2xo.pgh.pa.us> In-Reply-To: <200111141433.fAEEX2E71690@whizzo.transsys.com> 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 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-mobile" in the body of the message
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