Cyrus (Sieve) and external programs

Hello, 

I'm trying to set up a spam learning system, and I would like to pipe
email places in (for example) the SPAM folder to an external program. 

I have cyrus 2.4.17 

Does any one know how or if this is possible in cyrus (or sieve)? 

I wasn't able to find any documentation about using external programs
with sieve. 

Thanks, 

Pedro Silva

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