On my Fedora system I collect the system emails to my user account. This results in a selection of daily emails outlining statuses which I am prompted to deal with whenever I launch a terminal. In the past I have used the "mail" command to read and delete the messages. It is not the easiest mail reader to deal with however. The fallback has been to use Evolution which is part of Gnome. I have never been a fan of Evolution, instead preferring Thunderbird. Thunderbird does not support the maildir format used by the system email and as such has been ruled out. I am going to be trying out Mutt, it is a command line reader that I found already installed on my system. The interface is structured unlike "mail" and even lists the shortcuts for commonly used commands. For my needs I don't need to configure Mutt to do anything. I did find a couple of links that may prove useful in making Mutt your primary email client.