Install exmh by entering the following commands in the terminal:
sudo apt update sudo apt install exmh
Description:
extensible X user interface for MH mail
Exmh uses the regular MH programs to manipulate your mail folders and messages. This means it is compatible with command-line use of MH programs, and its actions should be familiar if you are an experienced MH user. If you are a new MH user, then the details of running MH programs are hidden behind the graphical interface.
Homepage: http://www.exmh.org/
Version: 1:2.8.0-7
Section: universe/mail