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Re: [dnsext] loads of TXT records for fun and profit

David Conrad <drc@virtualized.org> Fri, 03 May 2013 21:01 UTC

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From: David Conrad <drc@virtualized.org>
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References: <20130425013317.36729.qmail@joyce.lan> <80ADB3EE-17FD-4628-B818-801CB71BCBFE@virtualized.org> <alpine.BSF.2.00.1304242309150.38677@joyce.lan> <46778ED3-35A2-44B4-BE3C-AAC4F7B314FF@virtualized.org> <92BBD83F-676D-4B05-B927-4101DD5CAD3E@neustar.biz> <DC121025-A014-492B-AFAD-22CDE49D866E@rfc1035.com> <CAMm+Lwi4MAjX8BAk_ro9usf6AJo=1UERhGBJ1rUa-AbrX09dqg@mail.gmail.com> <E5E3F801-6490-48A8-A12F-A6561893D78A@icsi.berkeley.edu> <D00A1E79-40F2-4EFF-975C-8618C7AC750A@virtualized.org> <20130503203921.GA22566@redoubt.spodhuis.org>
To: Phil Pennock <namedroppers+phil@spodhuis.org>
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Subject: Re: [dnsext] loads of TXT records for fun and profit
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Phil,

On May 3, 2013, at 1:39 PM, Phil Pennock <namedroppers+phil@spodhuis.org> wrote:
> That is not my understanding as a reader of RFC4408 and as someone who
> worked with the coder (and documented the results) for the handling of
> TXT records in a widespread MTA to be as flexible as possible and to
> support SPF-style lookups.

Last sentence of RFC 4408, section 3.1.3:

"  SPF or TXT records containing multiple strings are useful in
   constructing records that would exceed the 255-byte maximum length of
   a string within a single TXT or SPF RR record."

Sure sounds to me like 4408 anticipates multiple TXT RRs.

Regards,
-drc

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