https://issues.apache.org/SpamAssassin/show_bug.cgi?id=6156





--- Comment #33 from Mark Martinec <[email protected]>  2009-09-02 05:05:24 
PST ---
> recognizing genuine yahoo and gmail.com mail is reliably and
> quickly done by verifying their DKIM signatures. A meta rule
> could turn a hit on DKIM_VALID_AU combined with a From in
> gmail.com or yahoo.com to implicitly turn on RCVD_IN_DNSWL_MED.

With the most recent change to a DKIM plugin in SVN this is even simpler:

full   DKIM_VALID_YG eval:check_dkim_valid

('gmail.com','googlemail.com','googlegroups.com','yahoogroups.com','.yahoo.com','yahoo.ca','yahoo.de','yahoo.fr','yahoo.in','yahoo.co.in','yahoo.co.jp','yahoo.co.nz','yahoo.co.uk','yahoo.com.hk','yahoo.com.ph','yahoo.com.vn')
score  DKIM_VALID_YG -0.5
meta   RCVD_IN_PSBL_NOYG  RCVD_IN_PSBL && !DKIM_VALID_YG
score  RCVD_IN_PSBL_NOYG  1
score  RCVD_IN_PSBL 0.1

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