What do you think about Spark (by Readdle) security?

Here’s a follow up question I sent them:

Thank you for your reply. I can’t tell you how much I enjoy using Spark on my iPhone. It’s the first 3rd party Mail app I feel comfortable with. I’m writing up a review of my experience and hope to post it soon.

I wonder if you could clarify just a few points though, for people who are concerned with privacy.

  1. Does the search feature require keeping emails on your server?

  2. Even with all the security protections, is it physically possible for Readdle staff to read our personal emails?

  3. Is it possible for our passwords to get stolen and used - by someone else, or an errant Readdle staffer?

  4. How can you run services which require ongoing use of your servers (push, teams, etc.) without a regular subscription fee?