Sorry to say this, but that was the same response you gave in 2015.
Whether people like it or not encryption is becoming more and more important and I’m increasingly using encrypted email. I have stored 10 years of email in DT some 90K emails. I’m now having to rethink this solution as encrypted email is no longer a luxury, but a necessity and DT does not support encrypted email.
It would be helpful if DT came off the fence and made a decision one way or the other rather than the “perhaps” response. After 6 years, your development dept should have been able to look at the feasibility of enabling importing encrypted email. That would at least allow users to work out what solutions they can look to for backing up their encrypted email.