1. Proton for Business
Best for encryption with client flexibility
What it does better than Tuta Mail
Proton matches Tuta's zero-access, end-to-end encryption but supports IMAP/SMTP through its Bridge app, PGP interoperability, and a full encrypted suite—Calendar, Drive, Docs, Pass, and VPN. Search and cross-platform apps are more capable, and it's Swiss-jurisdiction.
Where Tuta Mail still wins
Proton is pricier at the top tiers, and IMAP requires the desktop Bridge rather than working natively everywhere.
Best for: Privacy-focused teams that want encryption plus PGP and standard-client access.



