Secure Kolab accounts hosted in Switzerland for 8.99 CHF per month or 4.55 CHF for email-only accounts.
Kolab Now is hosted in Switzerland and benefits from the strong Swiss privacy laws. It is run exclusively with Free Software and using the service supports the development of Kolab.
Also, you can export all your data at any time and the terms of service received the best rating from ToS;DR.
The service uses Perfect Forward Secrecy and identifying information is stripped from email headers.