Note: For your Postfix SMTP server to work correctly, the PTR records of your server must match your_domain. For DigitalOcean, you can follow this introduction to DigitalOcean DNS for details on how to add them. You can purchase a domain name on Namecheap, get one for free on Freenom, or use the domain registrar of your choice. A fully registered domain name to host Mattermost, pointed to your server.For a guide on how to do this, complete Steps 1 to 4 of How To Install Nginx on Ubuntu 20.04. You’ll use it to enable sending email notifications from Mattermost. Visit the How To Install and Configure Postfix as a Send-Only SMTP Server on Ubuntu 20.04 tutorial to set this up. Postfix installed in send-only mode on your server.You can follow the short version outlined at the beginning of the tutorial. To see how to do this, visit How To Install MariaDB on Ubuntu 20.04. You can set this up by following this Initial Server Setup Guide. A server running Ubuntu 20.04 with at least 2GB RAM, root access, and a sudo, non-root account.Then, you’ll enable email notifications, customize branding, and create your messaging board (called a team in Mattermost). First, you’ll install it and expose it at your domain, secured with a free Let’s Encrypt TLS certificate. In this tutorial, you will set up the Mattermost Team Edition on your Ubuntu 20.04 server. It’s accessible from every type of modern device due to its responsive web interface and dedicated mobile apps. Mattermost also provides webhooks and bot integration for further customization. It offers group, threaded and one-to-one messaging, unlimited search history and file sharing capabilities, two-factor authorization and notifications. Mattermost is an open source collaboration and messaging platform created with security and configurability in mind providing comparable functionality to Discord or Slack. The author selected the Free and Open Source Fund to receive a donation as part of the Write for DOnations program.
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