Gregory's Server@Tutanota I‘d like to have a NATIVE iOS app. Or at least an experience that feels kinda native. You can partner up with one of the many e-mail client makers and offer a way to use selected third-party apps for your e-mail service (for paid users only).
@camey Thanks for your feedback, we'll take this into account. But third-party apps can't be used due to the encryption - we make sure that the data is always encrypted, even on your device!