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Re: [dnsext] SPF, a cautionary tale

Mark Andrews <marka@isc.org> Sun, 05 May 2013 11:06 UTC

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To: bmanning@vacation.karoshi.com
From: Mark Andrews <marka@isc.org>
References: <8D23D4052ABE7A4490E77B1A012B63077516EA82@mbx-01.win.nominum.com> <20130503171843.39672.qmail@joyce.lan> <20130504133312.GA27772@vacation.karoshi.com.> <alpine.BSF.2.00.1305041103360.8602@joyce.lan> <20130505012216.GA29079@vacation.karoshi.com.> <alpine.BSF.2.00.1305042223280.10848@joyce.lan> <20130505032549.GA30757@vacation.karoshi.com.> <alpine.BSF.2.00.1305042327490.11044@joyce.lan> <20130505085348.GA6061@vacation.karoshi.com.>
In-reply-to: Your message of "Sun, 05 May 2013 08:53:48 +0000." <20130505085348.GA6061@vacation.karoshi.com.>
Date: Sun, 05 May 2013 21:06:34 +1000
Message-Id: <20130505110635.0D83433E9BFC@drugs.dv.isc.org>
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Subject: Re: [dnsext] SPF, a cautionary tale
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	I looked a 25579 unique domains that have sent me email
	over the last 20 odd years.

	737 (2.88%) failed to resolve when queried with SPF
	of those 737, 178 subequently succeeded with A TXT query

	853 (spf query) + 102 (txt query) of those return a non
	empty answer section (138 + 4 cnames). 

	As far as I can see  success difference between SPF and TXT
	is at the noise level.

	Mark
-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka@isc.org

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