I investigated all the big players including ProtonMail, Tutanota, MailFence etc, I even considered the risks of running my own mailserver using something like mail-in-a-box but I’ve been there, done that, and don’t fancy doing it all again.
Long story short but I settled on a premium account from Tutanota with a new domain to start using for our ‘serious’ mails, keeping the long-running domain and email addresses for stuff that we’re not too bothered about.
- Tutanota have their own client across most common platforms
- The client can include calendars and contacts, both fully encrypted
- Lots of security and encryption stuff which you can read about here
- It’s cheap, working out at €1/month/user for the basic premium package
- It works, and seems to work well, so far we’ve had no issues
- Dead easy to use with a custom domain too
- No import feature to take your existing mailbox with you. This may be a deal breaker for some but it gave me the opportunity to effectively start again
- No facility to use mail clients such as Outlook or mac mail, you have to use the tutatnota client
- Shared calendars and additional storage bump the price up considerably but to no more than ProtonMail or Gsuite
- It seems a small development team so new features etc can be slow, their roadmap is published however
- A small risk of the company not surviving or being hoovered up by a bigger player
- A small risk (anecdotal on reddit) of mails from tutatnota being rejected by some providers
Overall I’m happy with the service and the choice I made. I have a very secure, encrypted mailbox for all my sensitive stuff compared to the google world, I have the choice of using the tutanota encrypted calendar and contacts or my own self-hosted cal/carddav services, and it is at a price that I am more than willing to pay.