Date: Fri, 27 Aug 2010 10:24:44 -0700 From: Doug Barton <dougb@FreeBSD.org> To: Ronald Klop <ronald-freebsd8@klop.yi.org> Cc: freebsd-stable@freebsd.org, Andriy Gapon <avg@icyb.net.ua> Subject: Re: cname replace in mail address? [off-topic] (Re: Attn Ronald Klop) Message-ID: <4C77F4DC.9070807@FreeBSD.org> In-Reply-To: <op.vh27cqoy8527sy@212-123-145-58.ip.telfort.nl> References: <4C74261A.4000401@icyb.net.ua> <op.vh27cqoy8527sy@212-123-145-58.ip.telfort.nl>
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On 08/27/2010 01:03 AM, Ronald Klop wrote: > offtopic, but why do some mailers replace a CNAME in a mail-address? > > root@sheeva2:/var/vmail# host klop.yi.org > klop.yi.org CNAME thuis.klop.ws > thuis.klop.ws A 212.123.145.58 > > It is not the first time that I'm bitten by this, but I never understood > it. You've already received all the right answers but I figured I'd respond too since this is my area. Given that klop.yi.org is a CNAME, and that the target hostname (thuis.klop.ws) has no MX record, the fact that you receive any mail at all is a tribute to the robustness principle. :) If you're going to receive mail at thuis.klop.ws then you should really have an MX record for it. See http://dougbarton.us/DNS/MX.html for more information if you need more information or references to the standards. The simplest way to solve your mail delivery problem is to have the @hostname refer to a canonical host (I.e., with an A and/or AAAA record) which also has an MX record. If you insist on using klop.yi.org the _best_ way to do that would be to duplicate those 2 records from thuis.klop.ws. By adding an MX to thuis you are more likely to get mail if klop.yi.org is a CNAME to it, even though it's still not "right." hth, Doug -- Improve the effectiveness of your Internet presence with a domain name makeover! http://SupersetSolutions.com/ Computers are useless. They can only give you answers. -- Pablo Picasso
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