Re: Last Call: draft-klensin-rfc2821bis
"Frank Ellermann" <nobody@xyzzy.claranet.de> Wed, 26 March 2008 14:37 UTC
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From: Frank Ellermann <nobody@xyzzy.claranet.de>
Subject: Re: Last Call: draft-klensin-rfc2821bis
Date: Wed, 26 Mar 2008 15:36:17 +0100
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Bill Manning wrote: > sounds like a great way to reduce the incoming spam to me. Dunno, I normally want to know if a mail from me (really, SPF PASS and all) did not make it, and for that purpose I want the good bounces. If legit undeliverable mail ends up in black holes a.k.a. "spam filters" it can be a PITA. > What about the situation where mail emitted from a node > with only IPv4 addresses is resolvable in the IPv6 world? > same "one-way" spam. Is that so ? There is a way to map IPv4 to IPv6 addresses, as far as SMTP is concerned you can at least try to report errors. If you are on an IPv6 island with no way to reach the mapped addresses that won't help, but it is no protocol design issue for SMTP. >> they have to query for MX, A, and AAAA to finally find >> your IPv6 SMTP. > or... they have to query AAAA, then A, then MX No, MX comes always first, but you can of course swap AAAA and A, or in an IPv4-only scenario skip AAAA if you anyway can't use it. Q=mx needs to be first for domains without SMTP. It would waste time and bandwidth to try to reach them when that is not possible. In more convoluted examples it could be very wrong to send mails to an existing SMTP at the domain, if the MX doesn't offer to do this. That is no new 2821bis idea, that is as it always was since god posted STD 10 :-) > your arguing that because an SMTP agent implementation > policy might be in place, that every one who runs DNS > is now required (that "mandatory" thing) to install an MX? I hope we are talking about SMTP over TCP in the Internet. If we do, senders must somehow find an SMTP at a public IP for the destination mail addresses. For a domain literal that's directly the IP and you don't need DNS. In normal cases with a FQDN you need DNS anyway, to get the IP "by name". The standards since STD 10 require to try MX first to get a list of names and priorities, see above. And yes, the proposal for IPv6 is to make MX mandatory, as Keith said there will be a huge number of AAAA devices, and it would be a huge waste of time to time to try AAAA after MX for devices which never send or receive mail, e.g., a forged mail from webcam. Adding SPF "v=spf -all" everywhere is no alternative. Besides SPF is voluntary, not mandatory. Null-MX idea is another variant of "opt out" everywhere, also not attractive, why should all IPv6 devices with AAAA but no SMTP get null-MX records ? A realistic idea is "opt in" with an explicit MX. In your example you can still send from any AAAA you like, as long as the addresses use domains with an MX. Or with the old "implicit MX" A-fallback. But please no new AAAA-fallback. > placing an SMTP dependency in the DNS is (imho) > fundamentally wrong. AFAIK the MX-concept is *THE* fundamental idea in STD 10, later STD 3 eliminated the "source route" alternative(s). > IPv4 and IPv6 are pragmatically different address families. > Architecturally, the "right" thing to do would have been > to create a new class for IPv6 That's something I can't judge, I stay out of all flamewars about IPv6 and NATs here. But I know that Internet Drafts ignoring IPv6 are DoA, worse than forgetting security and privacy and IANA and I18N considerations... :-) With the situation as it is, and with respect to SMTP, the MX records can include an IPvAnything MTA for an otherwise IPvX-only domain. MX was always a good at such tasks, e.g., UUCP-domains with no IP at all. > Long and Lean - publication of data elements in the DNS > does not now and never has equated to reachability for > bit delivery. Okay, but 2821bis doesn't discuss SMTP over FidoNet or what else, it considers DNS with addresses and MX as given. If you want a note in 2821bis that this is actually limited to the IN class and not about Chaos etc. maybe John can do (?) Frank _______________________________________________ IETF mailing list IETF@ietf.org https://www.ietf.org/mailman/listinfo/ietf
- RE: Last Call: draft-klensin-rfc2821bis (Simple M… Hollenbeck, Scott
- Re: Last Call: draft-klensin-rfc2821bis (Simple M… Frank Ellermann
- Re: Last Call: draft-klensin-rfc2821bis (Simple M… Frank Ellermann
- Re: Last Call: draft-klensin-rfc2821bis (Simple M… Frank Ellermann
- Re: Last Call: draft-klensin-rfc2821bis (Simple M… Pete Resnick
- Re: Last Call: draft-klensin-rfc2821bis (Simple M… Ned Freed
- Re: Last Call: draft-klensin-rfc2821bis (Simple M… Frank Ellermann
- Re: Last Call: draft-klensin-rfc2821bis (Simple M… Dave Crocker
- Re: Last Call: draft-klensin-rfc2821bis (Simple M… Frank Ellermann
- Re: Last Call: draft-klensin-rfc2821bis (Simple M… John C Klensin
- Re: Last Call: draft-klensin-rfc2821bis (Simple M… Ned Freed
- Lists and aliases (Re: Last Call: draft-klensin-r… Harald Tveit Alvestrand
- Re: Last Call: draft-klensin-rfc2821bis (Simple M… Pete Resnick
- Re: Lists and aliases (Re: Last Call: draft-klens… Ned Freed
- Re: Lists and aliases (Re: Last Call: draft-klens… Tony Finch
- Re: Lists and aliases (Re: Last Call: draft-klens… Ned Freed
- Last Call: draft-klensin-rfc2821bis (Simple Mail … Frank Ellermann
- Re: Last Call: draft-klensin-rfc2821bis (Simple M… Ned Freed
- Re: Last Call: draft-klensin-rfc2821bis (Simple M… John C Klensin
- Re: Last Call: draft-klensin-rfc2821bis (Simple M… Frank Ellermann
- Re: Last Call: draft-klensin-rfc2821bis (Simple M… Ned Freed
- Re: Last Call: draft-klensin-rfc2821bis (Simple M… Pekka Savola
- Re: Last Call: draft-klensin-rfc2821bis Frank Ellermann
- Re: Last Call: draft-klensin-rfc2821bis Douglas Otis
- Re: Last Call: draft-klensin-rfc2821bis John C Klensin
- Re: Last Call: draft-klensin-rfc2821bis Mark Andrews
- Re: Last Call: draft-klensin-rfc2821bis John C Klensin
- Re: Last Call: draft-klensin-rfc2821bis Douglas Otis
- Re: Last Call: draft-klensin-rfc2821bis John C Klensin
- Re: Last Call: draft-klensin-rfc2821bis John Leslie
- Re: Last Call: draft-klensin-rfc2821bis Ned Freed
- Re: Last Call: draft-klensin-rfc2821bis Frank Ellermann
- Re: Last Call: draft-klensin-rfc2821bis Douglas Otis
- Re: Last Call: draft-klensin-rfc2821bis Ned Freed
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis Frank Ellermann
- Re: Last Call: draft-klensin-rfc2821bis Bill Manning
- Re: Last Call: draft-klensin-rfc2821bis Frank Ellermann
- Re: Last Call: draft-klensin-rfc2821bis Mark Andrews
- Re: Last Call: draft-klensin-rfc2821bis Bill Manning
- Re: Last Call: draft-klensin-rfc2821bis Bill Manning
- Re: Last Call: draft-klensin-rfc2821bis Ned Freed
- Re: Last Call: draft-klensin-rfc2821bis Ned Freed
- Re: Last Call: draft-klensin-rfc2821bis Willie Gillespie
- Re: Last Call: draft-klensin-rfc2821bis Mark Andrews
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis John C Klensin
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis Ned Freed
- Re: Last Call: draft-klensin-rfc2821bis Ned Freed
- Re: Last Call: draft-klensin-rfc2821bis Ned Freed
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis Markku Savela
- Re: Last Call: draft-klensin-rfc2821bis Ned Freed
- RE: Last Call: draft-klensin-rfc2821bis Hallam-Baker, Phillip
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis SM
- Re: Last Call: draft-klensin-rfc2821bis Bill Manning
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis Mark Andrews
- Re: Last Call: draft-klensin-rfc2821bis SM
- Re: Last Call: draft-klensin-rfc2821bis John C Klensin
- Re: Last Call: draft-klensin-rfc2821bis SM
- Re: Last Call: draft-klensin-rfc2821bis Pekka Savola
- Re: Last Call: draft-klensin-rfc2821bis Mark Andrews
- Re: Last Call: draft-klensin-rfc2821bis Frank Ellermann
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis Bill Manning
- Implicit MX and A RRs (was: Re: Last Call: draft-… John C Klensin
- Re: Last Call: draft-klensin-rfc2821bis Frank Ellermann
- Re: Last Call: draft-klensin-rfc2821bis Mark Andrews
- Re: Last Call: draft-klensin-rfc2821bis Frank Ellermann
- Re: Implicit MX and A RRs Tony Hansen
- Re: Last Call: draft-klensin-rfc2821bis John Levine
- Re: Last Call: draft-klensin-rfc2821bis Frank Ellermann
- Re: Last Call: draft-klensin-rfc2821bis John C Klensin
- Re: Last Call: draft-klensin-rfc2821bis Tony Finch
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis John Levine
- Re: Last Call: draft-klensin-rfc2821bis Eliot Lear
- RE: Last Call: draft-klensin-rfc2821bis Tony Hain
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis Dave Crocker
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- RE: Last Call: draft-klensin-rfc2821bis Hallam-Baker, Phillip
- Re: Last Call: draft-klensin-rfc2821bis Willie Gillespie
- IPv6 incentive? RE: Last Call: draft-klensin-rfc2… Hallam-Baker, Phillip
- Re: Last Call: draft-klensin-rfc2821bis Frank Ellermann
- Re: Last Call: draft-klensin-rfc2821bis Jim Fenton
- Re: Last Call: draft-klensin-rfc2821bis David Conrad
- RE: Last Call: draft-klensin-rfc2821bis Tony Hain
- Re: Last Call: draft-klensin-rfc2821bis Dave Crocker
- Re: Last Call: draft-klensin-rfc2821bis Frank Ellermann
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- RE: Last Call: draft-klensin-rfc2821bis Hallam-Baker, Phillip
- RE: Last Call: draft-klensin-rfc2821bis Tony Hain
- RE: Last Call: draft-klensin-rfc2821bis John C Klensin
- Re: Implicit MX and A RRs John C Klensin
- Re: Implicit MX and A RRs Matti Aarnio
- RE: Last Call: draft-klensin-rfc2821bis John C Klensin
- Re: Last Call: draft-klensin-rfc2821bis Mark Andrews
- Re: Implicit MX and A RRs Tony Finch
- Re: Last Call: draft-klensin-rfc2821bis Ned Freed
- Re: Last Call: draft-klensin-rfc2821bis Mark Andrews
- Re: Last Call: draft-klensin-rfc2821bis Joe Abley
- Re: Last Call: draft-klensin-rfc2821bis Mark Andrews
- Re: Last Call: draft-klensin-rfc2821bis John C Klensin
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis David Morris
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Implicit MX and A RRs Keith Moore
- RE: Last Call: draft-klensin-rfc2821bis michael.dillon
- Re: Last Call: draft-klensin-rfc2821bis Douglas Otis
- Re: Last Call: draft-klensin-rfc2821bis John C Klensin
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis Ned Freed
- Re: Implicit MX and A RRs Ned Freed
- Re: Last Call: draft-klensin-rfc2821bis Frank Ellermann
- Re: Last Call: draft-klensin-rfc2821bis John C Klensin
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis Ned Freed
- Re: Last Call: draft-klensin-rfc2821bis Frank Ellermann
- Re: Last Call: draft-klensin-rfc2821bis Pekka Savola
- Re: Last Call: draft-klensin-rfc2821bis John C Klensin
- Re: Last Call: draft-klensin-rfc2821bis Pekka Savola
- Re: Last Call: draft-klensin-rfc2821bis Frank Ellermann
- Re: Last Call: draft-klensin-rfc2821bis Ned Freed
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis Dave Crocker
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis Theodore Tso
- Re: Last Call: draft-klensin-rfc2821bis Frank Ellermann
- Re: Last Call: draft-klensin-rfc2821bis Henning Schulzrinne
- Re: Last Call: draft-klensin-rfc2821bis John Levine
- Re: Last Call: draft-klensin-rfc2821bis SM
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis SM
- Re: Last Call: draft-klensin-rfc2821bis John Levine
- Re: Last Call: draft-klensin-rfc2821bis Dave Crocker
- Re: Last Call: draft-klensin-rfc2821bis Henning Schulzrinne
- Re: Last Call: draft-klensin-rfc2821bis David Morris
- Re: Last Call: draft-klensin-rfc2821bis Dave Crocker
- Re: Last Call: draft-klensin-rfc2821bis Mark Andrews
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis John C Klensin
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis Tony Finch
- Re: Last Call: draft-klensin-rfc2821bis Henning Schulzrinne
- Re: Last Call: draft-klensin-rfc2821bis Bill Manning
- Re: Last Call: draft-klensin-rfc2821bis Dave Crocker
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis: closing … Tony Hansen
- Re: Last Call: draft-klensin-rfc2821bis: closing … Dave Crocker
- Re: Last Call: draft-klensin-rfc2821bis: closing … Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis: closing … Lisa Dusseault
- Re: Last Call: draft-klensin-rfc2821bis: closing … Douglas Otis
- Re: Last Call: draft-klensin-rfc2821bis: closing … Hector Santos
- Re: Last Call: draft-klensin-rfc2821bis: closing … Henning Schulzrinne
- Re: Last Call: draft-klensin-rfc2821bis: closing … Dave Crocker
- Re: Last Call: draft-klensin-rfc2821bis: closing … Paul Smith
- Re: Last Call: draft-klensin-rfc2821bis: closing … Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis: closing … Tom.Petch
- Re: Last Call: draft-klensin-rfc2821bis: closing … Hector Santos
- Re: Last Call: draft-klensin-rfc2821bis: closing … Robert A. Rosenberg