$ sudo apt-get update
$ sudo apt-get install dovecot-sieve 

dovecot-sieve is installed in your system.

Make ensure the dovecot-sieve package were installed using the commands given below,

$ sudo dpkg-query -l | grep dovecot-sieve *

You will get with dovecot-sieve package name, version, architecture and description in a table

dovecot-sieve package basic information: