From owner-freebsd-isp Sat Nov 2 16:20:21 2002 Delivered-To: freebsd-isp@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 628E137B401 for ; Sat, 2 Nov 2002 16:20:20 -0800 (PST) Received: from mtiwmhc14.worldnet.att.net (mtiwmhc14.worldnet.att.net [204.127.131.114]) by mx1.FreeBSD.org (Postfix) with ESMTP id AF29B43E3B for ; Sat, 2 Nov 2002 16:20:19 -0800 (PST) (envelope-from cswiger@mac.com) Received: from prime ([12.88.90.71]) by mtiwmhc14.worldnet.att.net (InterMail vM.5.01.05.12 201-253-122-126-112-20020820) with SMTP id <20021103002013.WWXK16189.mtiwmhc14.worldnet.att.net@prime>; Sun, 3 Nov 2002 00:20:13 +0000 Message-ID: <00f001c282ce$c38a74a0$0301a8c0@prime> From: "Charles Swiger" To: Cc: References: <157240-220021162215518870@M2W042.mail2web.com> Subject: Re: Sendmail/DNS Error Date: Sat, 2 Nov 2002 19:20:06 -0500 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Sender: owner-freebsd-isp@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org jeremy@cableaz.com wrote: > One of my mail servers is reporting some weird stuff. It appears to be > unable to resolve hostnames but in reality it is...?? [ ... ] > "Deferred: Name server: mx1.hotmail.com.: host name lookup failure" Transient DNS problems happen every once in a while. Does the mail go through in subsequent queue runs, or does it stay queued? Also, you aren't blocking port 53/tcp on a firewall, by any chance? If so, don't-- you're blocking DNS lookups for domains with a lot of MX's. Having a lot of records causes a DNS reply to come back via TCP and not UDP.... -Chuck To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message