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Proton
Empowering you to choose a better internet where privacy is the default. Protect yourself online with Proton Mail, Proton VPN, Proton Calendar, Proton Drive. Proton Pass and SimpleLogin.
Proton Mail is the world's largest secure email provider. Swiss, end-to-end encrypted, private, and free.
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SimpleLogin lets you send and receive emails anonymously via easily-generated unique email aliases.
You can download it directly from the software center by going into desktop mode! It runs like it normally would on any desktop, although you either need to enter desktop mode after restarts/power off to ensure its on. Feel free to send a message if you need help!
So I managed to find it, and I saw that recent reviews are very negative.
There is some way to get things going on startup on Steamdeck, even in Steam-mode (Big Picture mode? Not-desktop mode?). I had to do it for Syncthing, I just don't remember exactly what I did. I probably made a service file if I had to take a guess, but I think an "@reboot" cron job might work too