Date: Wed, 13 Jun 2007 09:58:16 +0700 (ICT) From: Olivier Nicole <on@cs.ait.ac.th> To: jhfoo-ml@extracktor.com Cc: freebsd-questions-local@be-well.ilk.org, freebsd-questions@freebsd.org Subject: Re: Shorten delay in sending mail to SMTP Message-ID: <200706130258.l5D2wGXT017437@banyan.cs.ait.ac.th> In-Reply-To: <466EBC05.3020202@extracktor.com> (message from Foo JH on Tue, 12 Jun 2007 23:30:13 %2B0800) References: <466CB2DF.30808@extracktor.com> <9ADFB3BA-F02E-458D-80C1-2F13EAC769EF@mac.com> <466E695E.8030300@extracktor.com> <200706120949.l5C9nrPB088807@banyan.cs.ait.ac.th> <466EBC05.3020202@extracktor.com>
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> Can anyone confirm that Qmail/ inetd/ FreeBSD does some form of dns > lookup on it's SMTP? It most certainly does, that would be configurable, but you can confirm that by yourself: look at the full headers of the email you receive, you should see some headers saying something like: Received: from mx2.freebsd.org (mx2.freebsd.org [69.147.83.53]) by mail.cs.ait.ac.th (8.13.1/8.12.11) with ESMTP id l5CFXURR030909 for <on@cs.ait.ac.th>; Tue, 12 Jun 2007 22:33:34 +0700 (ICT) Now consider the top most of the Received-by headers, this top most one has been generated by your qmail server. Does it have an IP address associated to the the name of the sending machine (mx2.freebsd.org [69.147.83.53])? If yes, it means qmail did some DNS resolving. bests, Olivier
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