Debian 11 has been released so it's time to upgrade. I only have postfix and a web server running on my server so it was pretty easy to make the switch from buster to bullseye. First edit /etc/apt/sources.list and replace the word buster with bullseye. That includes changing buster-updates t...

I have been running my own mail server for years on my home broadband connection. Most of the time it has been running fine, and when the connection does go down it hasn’t been for long enough to cause any email problems. But what if I my mail server did lose its internet connection for a couple of...