$ sudo apt-get update
$ sudo apt-get install mailutils-imap4d 

mailutils-imap4d is installed in your system.

Make ensure the mailutils-imap4d package were installed using the commands given below,

$ sudo dpkg-query -l | grep mailutils-imap4d *

You will get with mailutils-imap4d package name, version, architecture and description in a table

mailutils-imap4d package basic information: