Install libnet-managesieve-perl by entering the following commands in the terminal:
sudo apt update sudo apt install libnet-managesieve-perl
Perl client module for ManageSieve
Net::ManageSieve is a Perl module that provides a client interface to the ManageSieve protocol. It manipulates scripts on a host running a ManageSieve service; this module does not perform, validate or do anything else like the Sieve scripts themselves.