Date: Wed, 3 Apr 2002 23:12:44 -0500 From: Jim Freeze <jim@freeze.org> 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> 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 References: <20020404033805.25427.qmail@mail.the-i-pa.com>
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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
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