And probably won’t be one. If you want it, use Proton.

I use their paid tier mostly for custom domains. Tuta gives me 3 custom domains and Proton only offers 1 on their respective base paid plans, so Tuta gets my business.

I don’t think the encryption difference matters all that much, what matters to me is:

• FOSS clients
• custom domains (so I can easily switch providers or self-host); I need at least two
• local decryption

Tuta provides those, Proton doesn’t, and I don’t need the extra features Proton provides, so Tuta gets my money. I just wish Tuta had a few minor more features, like:

• labels - allegedly in development
• better calendar sharing - I’d love to sync NextCloud and Tuta calendar automatically
• reply as Gmail/etc - makes it much easier to switch from other providers, probably nothing they can do though
• features to make it easier to leave - auto forwards and whatnot

It meets my needs though.

My problem is what happens if my internet goes down when there’s an important email or something. I suppose I could run it on a VPS just in case, but that’s still not as reliable as an email service, nor is it necessarily cheaper.

So I pay for Tuta email. It’s €3/month, supports my custom domains, and generally works pretty well. My VPS costs €4.5/month, and I may get rid of it once my city finishes rolling out fiber because I only need it due to CGNAT. Neither is particularly expensive, but Tuta is really good value for what I get. If my family members want to join, costs will go up (€3/user), so I may consider switching if that happens.