$ sudo apt-get update
$ sudo apt-get install claws-mail-fancy-plugin 

claws-mail-fancy-plugin is installed in your system.

Make ensure the claws-mail-fancy-plugin package were installed using the commands given below,

$ sudo dpkg-query -l | grep claws-mail-fancy-plugin *

You will get with claws-mail-fancy-plugin package name, version, architecture and description in a table

claws-mail-fancy-plugin package basic information: