When you are online, when you write messages etc. everything but the messages itself

Well stuff on play store is full of tracking etc.

Use your own. I use unbound.

Oh thanks, gonna take a look at motion.

I don’t get it. Ads are ads. I block them all.

You could use docker images and one of the following solutions:

• https://github.com/mailcow/mailcow-dockerized
• https://github.com/Mailu/Mailu

Find more here: https://github.com/topics/mailserver

You can selfhost your own mailserver and you have full control over the data.

Same + ublock origin

Aegis on my phone and also Keepassxc on desktop.