Invoking the spam checker on the sieve script

[Alejandro Exojo]

Hi.

TL/DR version:

Is it advisable to invoke an spam checker from the sieve script, and then, 
once the message is filtered, decide if should be moved to a certain spam 
folder?

A bit more context on why I'm considering this:

I'm just a geek who wants to handle his own mail, but not a great experience 
as a system administrator. I don't have any corporate setup, just a simple VPS 
with me as the only user.

Previously I fetched all my mail through POP, and in the client of my PC I 
moved (lots of) mailing list traffic to its folders. Then, for those remaining 
messages (and only those remaining) I passed the spam filter and moved to spam 
folder. That's a significant saving since I have many mailing list 
subscriptions, and now I'm even using rss2email, so I have lots of email that 
is not spam.

I moved to IMAP and my filters are server side with sieve, but I don't have 
spam filtering yet. I thought I could replicate the setup easily, but it seems 
nobody is doing that, and everyone has the mail already scored when it reaches 
sieve. Seems like the "extprograms" extension would be a fit, but again, nobody 
seems to mention on documentation, so I'm fearing I'm probably wrong.

Suggestions?

Thank you very much!

-- 
Alex (a.k.a. suy) | GPG ID 0x0B8B0BC2
http://barnacity.net/ | http://disperso.net