automove marked spam to junk folder

Is it possible to automove spam marked emails to folder junk.
I do not use roundcube, neither have it's plugins installed.
I do not use other webmail too, just plain imap client like thunderbird.
If that's possible any help will be appreciated.

Close the topic.
I found out how.
For those interrested, you need to add the word sieve in ldp section in dovecot.conf file
and add default sieve destination in plugin section.