From owner-freebsd-questions Wed May 24 13: 0:58 2000 Delivered-To: freebsd-questions@freebsd.org Received: from gekko.i-clue.de (server.ms-agentur.de [62.153.134.194]) by hub.freebsd.org (Postfix) with ESMTP id 3E61337BDB6 for ; Wed, 24 May 2000 13:00:52 -0700 (PDT) (envelope-from so@server.i-clue.de) Received: from i-clue.de (automatix.i-clue.de [192.168.0.112]) by gekko.i-clue.de (8.9.3/8.9.3/SuSE Linux 8.9.3-0.1) with ESMTP id PAA08921; Tue, 23 May 2000 15:57:13 +0200 Message-ID: <392A71A2.487BEF4F@i-clue.de> Date: Tue, 23 May 2000 13:55:14 +0200 From: Christoph Sold Organization: i-clue interactive GmbH X-Mailer: Mozilla 4.72 [en] (WinNT; U) X-Accept-Language: en MIME-Version: 1.0 To: Willem Brown Cc: questions@FreeBSD.ORG Subject: Re: DNS and e-mail. References: <392A6565.B3E2FDD8@brwn.org> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Willem, sendmail in recent versions checks the the sender's domain resolves both forward ("mail.expample.org" -> 1.2.3.4) and backwards ("4.3.2.1.in-addr.arpa." -> "mail.example.org"), to make life more difficult for spammers. Some other MTAs may check this, too. -Christoph Sold Willem Brown wrote: > Hi, > > I'm running a secondary DNS for my domain which is > hosted by Granitecanyon. The idea was that whenever the two > main DNS servers are unavailable that mine will be used so > I don't get cut off from the world completely. > > Every time I send a e-mail to the questions mail list, > it would seem that every mail server that receives that e-mail > queries my puny DNS server. Practically DOSsing it, well > maybe not quite. > > Normally I don't see much DNS traffic if any at all > because the main servers is far better connected and capable. > > What then causes my DNS to be queried when I send an > e-mail to the list? Any ideas? > > Regards > Willem Brown > -- > |--------------LINUX & *BSD, the CHOICE is yours--------------| > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-questions" in the body of the message To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message