I would love to use you service but it is not acceptable for me to share my email contents with someone else. Look at how mega cloud storage are protecting users files
Sorry to hear that! I'd love to find out more about how we could resolve that issue. Privacy and security are extremely high on our priority list since email is such an intimate communication channel.
Perhaps you could have a privacy policy which clearly states no text from user emails will be looked at by humans.
It's possible, though not easy, for a limited form of client-side encryption to be used while still offering autocomplete; e.g. if each word is encrypted client-side with a per-client secret, an encrypted "next word" could be determined and returned without the server ever knowing the specific words and sentences it operated on (other than length). There are other caveats here.
> Privacy and security are extremely high on our priority list
The lack-luster privacy policy doesn't show that at all.