[Dovecot] Dovecot-LDA & sieve

[Björn Ketelaars]

I’m trying to make use of sieve by means of the Dovecot LDA Wiki - 
http://wiki.dovecot.org/LDA.
Looking at maillog, mail is being delivered by means of deliver to the 
right user:

Jan 22 16:05:31 gateway sm-mta[17258]: STARTTLS=server, 
relay=[10.0.0.100], version=TLSv1/SSLv3, verify=NO, 
cipher=DHE-RSA-AES256-SHA, bits=256/256
Jan 22 16:05:32 gateway sm-mta[17258]: k0MF5VJ2017258: 
from=<bjorn at hydroxide.nl>, size=354, class=0, nrcpts=1, 
msgid=<43D39F31.3080502 at hydroxide.nl>, proto=ESMTP, daemon=MTA, 
relay=[10.0.0.100]
Jan 22 16:05:32 gateway sm-mta[32229]: k0MF5VJ2017258: to=| 
"/usr/local/libexec/dovecot/deliver", ctladdr=<test at hydroxide.nl> 
(1000/1000), delay=00:00:00, xdelay=00:00:00, mailer=prog, pri=30633, 
dsn=2.0.0, stat=Sent

Unfortunately .dovecot.sieve is left alone and thus nothing is being sorted.

Any suggestions maybe?