Yes. You have to use DAVx5.

Fossify Calendar and Fossify Contacts on Android and Thunderbird in Linux.

I can highly recommend Baïkal.

Why isn't posteo.de in the list? They are like Tuta, but with some more features like IMAP/SMTP.

Auxio. Exists in F-Droid.

I found QMMP few years ago. As a fan of Winamp, I haven't looked back yet. QMMP is compatible with Winamp skins too.

I am not alone wanting to see screenshots of softwares before even installing them. If you refuse to provide screenshots because someone is not saying please, expect many will not try your DeltaChat client. Over and out.

Show us screenshots instead of telling us how the client looks like!

And when was "last time"? :) I have been using F-Droid for FairEmail since I tried the email client for the first time few years ago and I have never got any issues. Just updated FairEmail while writing this comment. Works just fine :)

Different people, different taste.

I love FairEmail because of its "millions" of settings and the privacy features, for an example if you press a link, you'll get a popup with options (for an example, what app you want to open the link with). And if the link contains trackers, FairEmail will remove these by default and saying "tracking parameters removed" with yellow text in bold.

K-9 Mail feels incomplete in comparison. Have you tried FairEmail?

Ah, yeah, of course :/ Will stick to my own XMPP server then.

Wait, what?! You can self-host Signal? Please send me a guide!

Indeed. Their knowledge and detailed articles are pure gold!

Sorry for the delayed reply, but this issue got fixed maybe 2 months ago :)

Vaultwarden, linkding, Snikket, Miniflux, and some more.

• Your IP address should always be private even if it is good with IP bans. But IP bans do not fix the issue if it is not a static IP address that the users always has.
• Exactly :)
• Yepp! But they do log it anyway. So the question is why do the log this data? To build a better service? Might be, yes, but it would be much better if they let their users to choose if they want to share this information. Not log it automatically behind their backs (many do not read privacy policies).
• I understand that, but they should not force users to enter their phone number. They should instead come up with another solution like require more CAPTCHA's. Phone numbers is "the best" solution, but should not be standard.

XMPP with OMEMO.

• Nope. Not everywhere.
• The actual data is stored in plain text. The hard drive is encrypted. This is called encryption at-rest which Discord uses. Even Google uses this for Google Drive. Hackers "can't" access the data, but the people working there can. It doesn't matter if they have fancy roles, your personal data can be access by the people at the company. Your personal data should always stay personal.
• No cookies. Stored on their servers.
• I was forced to enter my phone number before I got as privacy aware as I am today. I doubt that has changed.

Why not Mumble and IRC or XMPP?

• Your IP address will be logged as soon as you login.
• They store everything you send in plain text on an encrypted storage unit.
• They store if your microphone and/or camera is on or off + more of what settings you have made in your own device.
• They force you to give them your phone number in order to identify you.

Source: https://discord.com/privacy

Discord is a privacy nightmare, but not as much as for an example Spotify. Spotify even logs how you hold your device and how fast you move it! Source: https://www.spotify.com/uk/legal/privacy-policy/