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.
I recently upgraded from Mozilla Thunderbird 2 to the new Thunderbird 3 release. For a few days everything was working fine with the new default settings. I have a few email accounts which Thunderbird fetches mail for and I didn't want to use the new Smart Folder mode. So I changed back to not using it. Everything appeared ok, until the next day. I returned home from work to find no new email. This is highly unusual as there is usually some for of advert for an online store showing me the latest offers, especially around christmas time. This lack of email continued for a few days, to begin with I attributed this to my ISP who were reporting problems with the email system. Today after 4 days with no new mail it was time to explore more options within Thunderbird and try to find a solution to the problem.
The solution came about by chance whilst browsing the Account Settings screen. The route to the solution from the main screen is shown below.
Tools > Account Settings > Click 'Server Settings' option under your problem account(s) > Click 'Advanced' button towards the bottom right > Select 'Global Inbox' option and check the 'Include this server when getting new mail' box.
This process should re-enable your account and allow you to get your missing emails.