How to Install Thunderbird Email Client and Configure PGP RSA Public Private Key Encryption

You hold your private key with Thunderbird email client. Not some email provider that will fold when men in black show up.

The following instructions for Thunderbird installation were generated installing on MS Windows.  For installation of Thunderbird on a box running Ubuntu Linux you will have a short detour when setting up your email accounts.   Notes and instructions for that can be found here:  Ubuntu Linux Thunderbird Email Client Install and Debug

Installing SeaMonkey on Ubuntu Linux

Research Links

Method 1: Using the Ubuntuzilla Repository

This method makes it easier to update SeaMonkey in the future via apt upgrade

  1. Open the Terminal (Ctrl+Alt+T).
  2. Add the Repository: Run the following command to add the repository to your system:

    cat <<EOF | sudo tee /etc/apt/sources.list.d/mozilla.list
    deb http://downloads.sourceforge.net/project/ubuntuzilla/mozilla/apt all main
    EOF
    
  3. Import the GPG Key: This ensures the package integrity.

    sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 2667CA5C
    
  4. Update and Install: Update your package list and install the latest English build.

    sudo apt-get update
    sudo apt-get install seamonkey-mozilla-build

How to Install Mattermost on a LocalHost Server

His Discord server: https://discord.com/invite/RjZWuyd


You can go direct, use docker or try with PPA.  Docer version of the install is said to be easier.   However for production installs the tarball method is better.   


?Open Source?

Mattermost Team Edition (open source) is a self-hosted, MIT-licensed platform designed for small to medium teams, allowing up to 250 users. While it allows for high, sometimes unlimited user counts in practice, it is largely limited by a 10,000-message search/visibility cap (as of recent changes), restricting historical access to conversations. 

Key Limitations of Team Edition:

  • Message/Search History: Restricted to 10,000 total messages. Older messages are inaccessible in search or navigation.
  • User Limit: Intended for smaller teams, often cited around 250 activated users.
  • Feature Gaps: Lacks advanced Enterprise features like SAML/SSO authentication, advanced compliance, granular permissions, and high-availability clustering.
  • Board Cards: Limited to 1,000 boards cards.
  • Support: No direct commercial support, relying on community forums. 

Installation Set 1:

Installation Set 2: 

Choose which technology base and installation method best supports your organization’s orchestration needs. All methods install Mattermost Entry — a free limited-use edition of Enterprise Advanced for technical evaluation, with the option to upload a license to unlock full access.

Alternatives: