Hi.
I am very extremely on both time and network connectivity, so I'm going to
have to be brief and cryptic.
Before the IETF meeting, I used a spammer's list of email addresses to
get a list of 1.3 million domain names. (I would like to thank both
the stupidity of a spammer for leaving his website open, and for IIS
for not recognizing index.html for this information.)
During my search, I found *no* TXT records that were even close to
conflicting with the "v=spf1" magic number.
Considering that 50% of all SPF records are under 35 bytes, and 99.8%
are under 200 bytes, I really don't think that the size of SPF records
is an issue.
Anyway, I thought you guys might be interested in them.
1289260 total domain names
33016 total TXT records found (some domains have more than one)
6320 have SPF records -> 19.1% of all domain level TXT records are
spf records
26359 domains have txt records
6315 domains have spf records
1456 domains found that were also in the adopt roll -> 23.0%
14192 spf_domains adoption roll
61554 estimated domains have SPF records. (This probably misses
most parked domains, of which I have heard rumors that there
are a least a couple hundred thousand with SPF records.
On each domain that had TXT records, the total size in bytes of these
records add up as follows:
Domains that already need to fall back to DNS over TCP:
2262 pokynet.com
840 baycom.de
623 andrew.cmu.edu
569 spencerstuart.com
504 mail.tpgi.com.au
487 themovieman1.com
6
Domains that may need to fall back to DNS over TCP if SPF is added
432 nwm.com.br
415 quito.digi-net.com
412 chalmers.se
409 far.toad.com
407 bewley.net
5
Domains that have over 300 bytes of TXT records
378 nationalgeographic.com
360 proxy-service.LB-A.stanford.edu
337 internet.co.uk
336 webdepro.com
336 magicplaza.org
336 bleh.net
336 biotul.com
336 almaplan.com
318 pony.its.uwo.ca
315 hive.no
302 uni-heidelberg.de
-wayne