Ok, recommendations so far: Mailbox, Proton, Tuta, Posteo.
Excluding Proton for "on my personal shitlist" reasons.
Will ignore Tuta free tier as I don't want to be dependent on a fundamentally unsustainable business model.
Don't need bells & whistles so always going with the lowest paid tier. This unfortunately kicks out Tuta as they are 3x as expensive.
Posteo is kinda ... eh for me as it requires pre-payment, limited to 12mo - I know myself, at some point I will forget. So... Mailbox I guess?


@nyanbinary I moved/moving to Tuta. So far I reeeeallly like it. Adding custom domains and address was easier than Google Workspace. The same process will validate your MX, SPF, DKIM, DMARC and MTA-STS.
They donโt support ruf due to privacy, which is fine. I only care about rua since I roll on strict reject.