Addition of Another Spam filter to Amavis

[ashish behl]

Hello All,
I was trying to add another spam filter to Amavis, using @spam_scanners array defined in amavisd-new code.
But, I soon realised reading Amavis code that Amavis has support only for the 4 Spam filters (SpamAssassin, DSPAM, CRM114, Bogofilter).package Amavis::SpamControl::ExtProg;   sub check_or_learn only supports the above mentioned filters by reading specific headers.
Please let me know if I am right? Is there another way to add a new spam filter support to amavis? 
Regards,
Ashish
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