I’m trying to both simplify my subscriptions and shift away from Proton (for a number of reasons), and I’m undecided where I want to go for email. I’m mainly thinking about (as the title indicates) Runbox and Mailbox, but I’m open to other suggestions as well.

I want a service that’ll work with a normal email client. I’m likely going to use addy.io for aliases (with PGP), so the only time they’ll see my plaintext emails is the rare occasion I use the email address directly. I’m also planning to use a custom domain. I only care about email, since I’m planning to set up my own CalDAV server (and probably rely on Proton or Tuta until I do).

Does anyone know about how these services handle spoofing? I saw some concerning claims about Mailbox, but I’m not sure if they’re still valid.