From owner-freebsd-current Thu Jul 24 10:41:22 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.5/8.8.5) id KAA14177 for current-outgoing; Thu, 24 Jul 1997 10:41:22 -0700 (PDT) Received: from mail.calweb.com (mail.calweb.com [208.131.56.11]) by hub.freebsd.org (8.8.5/8.8.5) with ESMTP id KAA14172 for ; Thu, 24 Jul 1997 10:41:18 -0700 (PDT) Received: by mail.calweb.com (8.8.6/8.8.6) with SMTP id KAA17592; Thu, 24 Jul 1997 10:40:59 -0700 (PDT) X-SMTP: hello devnull from jflists@pop.calweb.com server @devnull.calweb.com ip 207.173.135.51 Message-Id: <3.0.3.32.19970724103920.0094c100@pop.calweb.com> Warning: Unsolicited Commercial Email (UCE) will be returned to send in bulk X-Sender: jflists@pop.calweb.com X-Mailer: QUALCOMM Windows Eudora Pro Version 3.0.3 (32) Date: Thu, 24 Jul 1997 10:39:20 -0700 To: Anthony.Kimball@East.Sun.COM, current@FreeBSD.ORG From: "jfesler@calweb.com" Subject: Re: (over)zealous mail bouncing In-Reply-To: <199707241601.LAA03086@compound.east.sun.com> References: <199707241422.HAA00957@hub.freebsd.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Sender: owner-freebsd-current@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk At 11:01 AM 7/24/97 -0500, Tony Kimball wrote: >I beg to differ. Most machines which may validly receive email do *not* >have valid hostnames. Using the majority-minority rule, *you* lose. >That's reality. Um - MX records. The host names in the email addresses, should have valid MX records, and as a fallback, a valid A record (preferably MX records though). Otherwise, the email address in question is non-replyable. And if it's non-replyable, it's not acceptable either. We actively block any SMTP session where the MAIL FROM: command lacks a valid DNS entry. If it takes >3 seconds to resolve, we assume it's slow/unreachable DNS. If it takes <3 seconds to resolve, we fail it immediately with no retrys, as in every case it's either a bad hostname, fake domain name, or a typo on someone's host portion of an email address. In every case, the error message says to contact postmaster@calweb.com for assistance, which is immune to the filter. Even UUCP sites are safe from our filter - they have MX records pointing to valid MX receivers that will take mail for their domain names.. -- Jason Fesler jfesler@calweb.com 'whois jf319' | When the chips are down Admin, CalWeb Internet Services www.calweb.com | The buffalo's empty Junk email returned in bulk; 1 cc to your postmaster | Junk mail probs? http://www.gigo.com/junkmail.htm | :-)