spf-discuss
[Top] [All Lists]

Current SPF accuracy figures from my mail spool

2003-12-17 00:59:03
Hi folks --

FYI, here's some figures on SPF's results in "real world" mail, from a
quick SpamAssassin mass-check/hit-frequencies run over my received mail
corpus for the last few weeks.

OVERALL%   SPAM%     HAM%     S/O    RANK   SCORE  NAME
   8796     2273     6523    0.258   0.00    0.00  (all messages)
100.000  25.8413  74.1587    0.258   0.00    0.00  (all messages as %)
  3.433   0.0000   4.6298    0.000   1.00   -0.10  T_SPF_PASS
  1.762   0.4399   2.2229    0.165   0.00    0.20  T_SPF_FAIL
  0.000   0.0000   0.0000    0.500   0.12    0.10  T_SPF_SOFTFAIL

So ~7% of my mail recently has been from people with SPF TXT records set
up!

Also currently, all the domains with SPF records are published by non-spam
people.  Not too surprising, that ;)

But in terms of SPF failures -- 2.2229% of my nonspam mail is failing the
SPF test.  That's 32% of all messages with an SPF record available. :(

As far as I can tell, this is because of mailing lists, including Yahoo!
groups and a couple of small-scale lists, and the .forward situation, all
of which are relaying a message and preserving the envelope from.

Looks like getting lists/.forwards updated to resend with a new envelope,
is going to be pretty important.

--j.

-------
Sender Permitted From: http://spf.pobox.com/
Archives at http://archives.listbox.com/spf-discuss/current/
Latest draft at http://spf.pobox.com/draft-mengwong-spf-02.9.4.txt
To unsubscribe, change your address, or temporarily deactivate your 
subscription, 
please go to 
http://v2.listbox.com/member/?listname(_at_)©#«Mo\¯HÝÜîU;±¤Ö¤Íµø?¡