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[spf-discuss] Re: Another test case for the test suite...

2007-01-10 10:21:55
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Wayne Schlitt wrote:
Julian Mehnle writes:
"quite a few" -- about how large a percentage of all the SPF-equipped
domains is that?  I'd be really interested.

Uh....

You have released Mail::SPF to the public.  Surely, you have tested
this code on a large number of domains under varying conditions.
Surely, the response you should be giving now is "my study of <x>
domains show <y>% failures, what are your results?"  Along with "is
<y>% really qualify as 'quite a few'?"

No, I haven't.  Why would I have done that?  Please suggest a methodology 
for "testing this code on a large number of domains under varying condi- 
tions" that would have helped with verifying the correctness of Mail::SPF 
(besides making sure it doesn't outright crash).  I don't see any.

(Before releasing it, I ran Mail::SPF on my own mail server for about a 
week, which handles several thousand mails per day (most of which is spam, 
as usual), though.)

I used to have a list of domains that would answer correctly for A
and MX records, but for TXT, they would timeout.  The number was quite
small and since I did the study several years ago, I don't have the
numbers handy.  IIRC, it was somewhere around 1 in 10,000 domains.

Unfortunately, besides this study's outdatedness, that doesn't say much 
about the degree of support for the SPF RR type.

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