It’s done to have a big contrast between the letter and its background, so you can read all the information all the time (except in edge cases, like the seconds in the video you show, the background is mostly 50-50 with black and white, so the text is kept in black, and can be a bit hard to read)

There’s a lot this plastic bag doesn’t deserve.

Thanks for the warning. Believe me, I know how mails can be hard to host, and I would have made the same warning to someone that wants to start self-hosting mails.

I wanted to update my already installed and already working system and check if something new appeared from the time I installed my server.

I use miniflux which is minimalist, yet has a lot of features.

As miniflux serves the Fever API, I can use nice RSS clients that sync across all my devices (like Reeder for iOS and macOS).