[Dovecot] sieve discard

Does the keyword/action discard work by default or is there something I have to do in the configuration to get to work... maybe I missed something on http://wiki.dovecot.org/LDA/Sieve

I have the following rule:

if anyof ( header :contains ["Subject"] ["Test Discard"] ) { discard; stop; }

but it delivers to INBOX with or w/o the "stop;". If I change the rule to

if anyof ( header :contains ["Subject"] ["Test Discard"] ) { fileinto "spam"; stop; }

the message will deliver into my spam folder which makes me think I am doing something wrong with "discard".

Using 1.0.2 sieve plug-in.

Thanks.