cname replace in mail address? [off-topic] (Re: Attn Ronald Klop)
offtopic, but why do some mailers replace a CNAME in a mail-address? r...@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. Ronald. On Tue, 24 Aug 2010 22:05:46 +0200, Andriy Gapon a...@icyb.net.ua wrote: Ronald, your email address bounces, that's inconvenient. Original Message Subject: Returned mail: Service unavailable Date: Tue, 24 Aug 2010 23:03:33 +0300 (EEST) From: Mail Delivery Subsystem mailer-dae...@citadel.icyb.net.ua To: a...@icyb.net.ua The original message was received at Tue, 24 Aug 2010 23:03:27 +0300 (EEST) from porto-e.starpoint.kiev.ua [212.40.38.100] - The following addresses had permanent fatal errors - ronald-freeb...@thuis.klop.ws - Transcript of session follows - ... while talking to thuis.klop.ws.: RCPT To:ronald-freeb...@thuis.klop.ws 554 5.7.1 ronald-freeb...@thuis.klop.ws: Relay access denied 554 ronald-freeb...@thuis.klop.ws... Service unavailable ___ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to freebsd-stable-unsubscr...@freebsd.org
Re: cname replace in mail address? [off-topic] (Re: Attn Ronald Klop)
In message op.vh27cqoy852...@212-123-145-58.ip.telfort.nl, Ronald Klop writ es: offtopic, but why do some mailers replace a CNAME in a mail-address? Because it used to be manditory to do so. If you don't want it to be done use a MX record. klop.yi.org MX 0 thuis.klop.ws If you need klop.yi.org to have a address record then give it one. klop.yi.org A 212.123.145.58 Mark r...@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 = =20 it. Ronald. On Tue, 24 Aug 2010 22:05:46 +0200, Andriy Gapon a...@icyb.net.ua wrote: Ronald, your email address bounces, that's inconvenient. Original Message Subject: Returned mail: Service unavailable Date: Tue, 24 Aug 2010 23:03:33 +0300 (EEST) From: Mail Delivery Subsystem mailer-dae...@citadel.icyb.net.ua To: a...@icyb.net.ua The original message was received at Tue, 24 Aug 2010 23:03:27 +0300 =20 (EEST) from porto-e.starpoint.kiev.ua [212.40.38.100] - The following addresses had permanent fatal errors - ronald-freeb...@thuis.klop.ws - Transcript of session follows - ... while talking to thuis.klop.ws.: RCPT To:ronald-freeb...@thuis.klop.ws 554 5.7.1 ronald-freeb...@thuis.klop.ws: Relay access denied 554 ronald-freeb...@thuis.klop.ws... Service unavailable ___ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to freebsd-stable-unsubscr...@freebsd.org -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: ma...@isc.org ___ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to freebsd-stable-unsubscr...@freebsd.org
Re: cname replace in mail address? [off-topic] (Re: Attn Ronald Klop)
Mandatory? I'm googling, but can't find a document that declares it mandatory and only sendmail seems to do it. I think it is lame to use DNS info to rewrite e-mail addresses, but the person who made it 'mandatory' will have good reasons for it. Does somebody have a pointer to the specs about this? Ronald. On Fri, 27 Aug 2010 10:21:27 +0200, Mark Andrews ma...@isc.org wrote: In message op.vh27cqoy852...@212-123-145-58.ip.telfort.nl, Ronald Klop writ es: offtopic, but why do some mailers replace a CNAME in a mail-address? Because it used to be manditory to do so. If you don't want it to be done use a MX record. klop.yi.org MX 0 thuis.klop.ws If you need klop.yi.org to have a address record then give it one. klop.yi.org A 212.123.145.58 Mark r...@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 = =20 it. Ronald. On Tue, 24 Aug 2010 22:05:46 +0200, Andriy Gapon a...@icyb.net.ua wrote: Ronald, your email address bounces, that's inconvenient. Original Message Subject: Returned mail: Service unavailable Date: Tue, 24 Aug 2010 23:03:33 +0300 (EEST) From: Mail Delivery Subsystem mailer-dae...@citadel.icyb.net.ua To: a...@icyb.net.ua The original message was received at Tue, 24 Aug 2010 23:03:27 +0300 =20 (EEST) from porto-e.starpoint.kiev.ua [212.40.38.100] - The following addresses had permanent fatal errors - ronald-freeb...@thuis.klop.ws - Transcript of session follows - ... while talking to thuis.klop.ws.: RCPT To:ronald-freeb...@thuis.klop.ws 554 5.7.1 ronald-freeb...@thuis.klop.ws: Relay access denied 554 ronald-freeb...@thuis.klop.ws... Service unavailable ___ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to freebsd-stable-unsubscr...@freebsd.org ___ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to freebsd-stable-unsubscr...@freebsd.org
Re: cname replace in mail address? [off-topic] (Re: Attn Ronald Klop)
On Fri, Aug 27, 2010 at 11:22:05AM +0200, Ronald Klop wrote: Mandatory? I'm googling, but can't find a document that declares it mandatory and only sendmail seems to do it. I think it is lame to use DNS info to rewrite e-mail addresses, but the person who made it 'mandatory' will have good reasons for it. Does somebody have a pointer to the specs about this? First hit on Google: http://www.ferris.com/2008/09/08/why-you-shouldnt-mix-cname-and-mx/ Bottom line: don't use CNAMEs, ever, unless you know ***exactly*** what you're doing. It's been like this for a very long time. -- | Jeremy Chadwick j...@parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB | ___ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to freebsd-stable-unsubscr...@freebsd.org
Re: cname replace in mail address? [off-topic] (Re: Attn Ronald Klop)
Mandatory? I'm googling, but can't find a document that declares it mandatory and only sendmail seems to do it. I think it is lame to use DNS info to rewrite e-mail addresses, but the person who made it 'mandatory' will have good reasons for it. Rewiting may not be mandatory, but it is certainly true that a domain needs to have either an A record or an MX record to recieve email according to the spec. Your has neither, and given the presence of a CNAME then rewriting the address to use that CNAME doesnt seem like an unreasonable thing to do. You should add an MX record to that domain - but mixing MX and CNAME is a fairly bad idea too (and that should be easily found in google). -pete. ___ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to freebsd-stable-unsubscr...@freebsd.org
Re: cname replace in mail address? [off-topic] (Re: Attn Ronald Klop)
Am 27.08.2010 11:22, schrieb Ronald Klop: Mandatory? I'm googling, but can't find a document that declares it mandatory and only sendmail seems to do it. I think it is lame to use DNS info to rewrite e-mail addresses, but the person who made it 'mandatory' will have good reasons for it. May have been RFC0974, perhaps in connection with others - January 1986... -- Matthias Andree ___ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to freebsd-stable-unsubscr...@freebsd.org
Re: cname replace in mail address? [off-topic] (Re: Attn Ronald Klop)
Does the recipient MTA actually receive for both klop.yi.org *and* thuis.klop.ws? The recipient MTA will dereference the CNAME and rewrite the envelope for the reason that it can only relay to an RR that points to a real host. You might be able to fix it if you configure the mta on thuis.klop.ws to accept mail for the thuis.klop.ws domain in addition to klop.yi.org (which I assume is how you have it setup). In a situation like this if you have domain CNAME originaldomain then you better make sure that someone can send to either @domain AND @originaldomain otherwise it doesn't make sense. On 2010-08-27 10:03:52AM +0200, Ronald Klop wrote: offtopic, but why do some mailers replace a CNAME in a mail-address? r...@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. Ronald. On Tue, 24 Aug 2010 22:05:46 +0200, Andriy Gapon a...@icyb.net.ua wrote: Ronald, your email address bounces, that's inconvenient. Original Message Subject: Returned mail: Service unavailable Date: Tue, 24 Aug 2010 23:03:33 +0300 (EEST) From: Mail Delivery Subsystem mailer-dae...@citadel.icyb.net.ua To: a...@icyb.net.ua The original message was received at Tue, 24 Aug 2010 23:03:27 +0300 (EEST) from porto-e.starpoint.kiev.ua [212.40.38.100] - The following addresses had permanent fatal errors - ronald-freeb...@thuis.klop.ws - Transcript of session follows - ... while talking to thuis.klop.ws.: RCPT To:ronald-freeb...@thuis.klop.ws 554 5.7.1 ronald-freeb...@thuis.klop.ws: Relay access denied 554 ronald-freeb...@thuis.klop.ws... Service unavailable ___ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to freebsd-stable-unsubscr...@freebsd.org -- === Peter C. Lai | Bard College at Simon's Rock Systems Administrator| 84 Alford Rd. Information Technology Svcs. | Gt. Barrington, MA 01230 USA peter AT simons-rock.edu | (413) 528-7428 === ___ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to freebsd-stable-unsubscr...@freebsd.org
Re: cname replace in mail address? [off-topic] (Re: Attn Ronald Klop)
On 08/27/2010 01:03 AM, Ronald Klop wrote: offtopic, but why do some mailers replace a CNAME in a mail-address? r...@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 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 ___ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to freebsd-stable-unsubscr...@freebsd.org
Re: cname replace in mail address? [off-topic] (Re: Attn Ronald Klop)
On 27 Aug, Ronald Klop wrote: Mandatory? I'm googling, but can't find a document that declares it mandatory and only sendmail seems to do it. I think it is lame to use DNS info to rewrite e-mail addresses, but the person who made it 'mandatory' will have good reasons for it. Does somebody have a pointer to the specs about this? http://www.rfc-editor.org/rfc/rfc1123.txt 5.2.2 Canonicalization: RFC-821 Section 3.1 The domain names that a Sender-SMTP sends in MAIL and RCPT commands MUST have been canonicalized, i.e., they must be fully-qualified principal names or domain literals, not nicknames or domain abbreviations. A canonicalized name either identifies a host directly or is an MX name; it cannot be a CNAME. ___ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to freebsd-stable-unsubscr...@freebsd.org
