dovecot-lda won't cause mail to be filtered by sieve

Hi

I'm changing from fetchmail to getmail, in order to fetch my mail from several mail servers and deliver it to my local dovecot server. Fetchmail supports LMTP, getmail doesn't. So I'm making getmail call dovecot-lda for delivering the mail. But now, the incoming mail doesn't get filtered through sieve any longer.

However, this command works:

sieve-filter -v -u v ~v/.dovecot.sieve INBOX -e -W expunge

Any ideas?

Greetings V.W.