From owner-freebsd-questions Wed Apr 3 20:13:50 2002 Delivered-To: freebsd-questions@freebsd.org Received: from freeze.org (freeze.org [63.106.140.202]) by hub.freebsd.org (Postfix) with ESMTP id 848F137B41C for ; Wed, 3 Apr 2002 20:13:47 -0800 (PST) Received: (from jfreeze@localhost) by freeze.org (8.11.6/8.11.6) id g344Ciq21057; Wed, 3 Apr 2002 23:12:44 -0500 (EST) (envelope-from jfreeze) Date: Wed, 3 Apr 2002 23:12:44 -0500 From: Jim Freeze To: wmoran@mail.the-i-pa.com Cc: freebsd-questions@FreeBSD.ORG Subject: Re: hub.freebsd.org spam policy Message-ID: <20020403231244.A21035@freeze.org> References: <20020404033805.25427.qmail@mail.the-i-pa.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: <20020404033805.25427.qmail@mail.the-i-pa.com>; from wmoran@mail.the-i-pa.com on Thu, Apr 04, 2002 at 03:38:05AM -0000 Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On Thu, Apr 04, 2002 at 03:38:05AM -0000, wmoran@mail.the-i-pa.com wrote: > I just got a new ISP and suddenly I can't send mail to the lists. > > So I can let my ISP know what he needs to fix, what exactly does > the server do with DNS to determine whether or not to reject a > connection? > Your IP needs a reverse DSN lookup. For example, my domain is freeze.org If I do an nslookup on freeze.org I get, Server: smtp.qx.net Address: 208.235.88.101 Non-authoritative answer: Name: freeze.org Address: 63.106.140.202 <= IP for freeze.org The reverse part is where we do an nslookup on the just obtained IP. It had better return freeze.org nslookup 63.106.140.202 Server: smtp.qx.net Address: 208.235.88.101 Name: freeze.org <= Reverse lookup matches original Address: 63.106.140.202 <= IP matches one above. I used to have a cable modem and the reverse lookup matched the original. Then, one day Insite decided to change their configuration and I was stuck. I ended up getting a business DSL account, and they provide the reverse lookup for me. However, if you have multiple domains mapped to a single IP, only one of them can be used for the reverse lookup. HTH. -- Jim Freeze If only I had something clever to say for my comment... ~ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message