From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.io/gmane.emacs.gnus.general/33737 Path: main.gmane.org!not-for-mail From: Lloyd Zusman Newsgroups: gmane.emacs.gnus.general Subject: Re: smtp authentication (sendmail relay) Date: 17 Dec 2000 17:26:58 -0500 Organization: FreeBSD/Linux Hippopotamus Preserve Sender: owner-ding@hpc.uh.edu Message-ID: References: <200012170829.eBH8T2Z30966@newsguy.com> NNTP-Posting-Host: coloc-standby.netfonds.no Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: main.gmane.org 1035169786 26646 80.91.224.250 (21 Oct 2002 03:09:46 GMT) X-Complaints-To: usenet@main.gmane.org NNTP-Posting-Date: Mon, 21 Oct 2002 03:09:46 +0000 (UTC) Return-Path: Original-Received: from lisa.math.uh.edu (lisa.math.uh.edu [129.7.128.49]) by mailhost.sclp.com (Postfix) with ESMTP id 5D74CD049D for ; Sun, 17 Dec 2000 17:27:27 -0500 (EST) Original-Received: from sina.hpc.uh.edu (lists@Sina.HPC.UH.EDU [129.7.3.5]) by lisa.math.uh.edu (8.9.1/8.9.1) with ESMTP id QAB26978; Sun, 17 Dec 2000 16:27:26 -0600 (CST) Original-Received: by sina.hpc.uh.edu (TLB v0.09a (1.20 tibbs 1996/10/09 22:03:07)); Sun, 17 Dec 2000 16:26:48 -0600 (CST) Original-Received: from mailhost.sclp.com (postfix@66-209.196.61.interliant.com [209.196.61.66] (may be forged)) by sina.hpc.uh.edu (8.9.3/8.9.3) with ESMTP id QAA07423 for ; Sun, 17 Dec 2000 16:26:34 -0600 (CST) Original-Received: from home.acholado.net (acholado.net [216.182.19.128]) by mailhost.sclp.com (Postfix) with ESMTP id BB16CD049D for ; Sun, 17 Dec 2000 17:26:58 -0500 (EST) Original-Received: by home.acholado.net (Postfix, from userid 510) id 854CA19E96; Sun, 17 Dec 2000 17:26:58 -0500 (EST) Original-To: ding@gnus.org X-Face: "!ga1s|?LNLE3MeeeEYs(%LIl9q[xV9!j4#xf4!**BFW_ihlOb;:Slb>)vy>CJM User-Agent: Gnus/5.0808 (Gnus v5.8.8) XEmacs/21.1 (Canyonlands) Original-Lines: 57 Precedence: list X-Majordomo: 1.94.jlt7 Xref: main.gmane.org gmane.emacs.gnus.general:33737 X-Report-Spam: http://spam.gmane.org/gmane.emacs.gnus.general:33737 Harry Putnam writes: > Lloyd Zusman writes: > > > Script started on Sun Dec 17 16:16:46 2000 > > 1> telnet smtp.newsguy.com 25 > > Trying 209.155.56.71... > > Connected to smtp.newsguy.com. > > Escape character is '^]'. > > 220 newsguy.com ESMTP Sendmail 8.11.0/8.9.1; Sun, 17 Dec 2000 13:14:33 -0800 (PST) > > ehlo asfast.com > > [...] > Ekkkk. I'll be damned: > bsd > telnet smtp.newsguy.com 25 > Trying 209.155.56.71... > telnet: connect to address 209.155.56.71: Connection refused > telnet: Unable to connect to remote host > reader@satellite /anex/reader > bsd > date > Sun Dec 17 14:01:54 PST 2000 > > > And... Newsguy tech staff have told me over the phone that telnet is not > allowed. > > Not sure what the deal is now. Well, the only thing I can think of is reverse DNS. Many servers don't allow connection to them unless the connecting host's IP address has a valid reverse DNS entry. The IP address of machine from which I was connecting indeed does have a valid reverse DNS entry, and so perhaps this is why my connection works. In case you don't know what "reverse DNS" is, it's a function of DNS service which will return your domain name when your IP address is fed to it. Normal, "forward" DNS goes in the opposite direction: it returns an IP address when a domain name is supplied. The people who supply your IP (i.e., your ISP) are responsible for supplying reverse DNS for your IP address. Ask your ISP if this can be enabled. It's extremely common these days for ISP's to provide reverse DNS, because for security reasons, most servers on the net (SMTP, NNTP, telnetd, ftpd, etc. etc. etc.) are requiring valid reverse DNS from those who connect to them. If your ISP won't supply this service, I regrettably must suggest that you switch ISP's. And by the way, if your ISP says that reverse DNS isn't possible with dynamic IP's, this isn't true, since many, many ISP's routinely supply proper reverse DNS entries for their dynamic IP customers. HTH -- Lloyd Zusman ljz@asfast.com