Crossbox - How to get help directly - FYI
Website is (https://crossbox.io/) and the chat button is on all pages. Currently a blue button - Bottom right.
I found them to be very responsive. Great Webmail App!
Also please feel free to reach out to us first. While they understand their software better and are better equipped to fix issues with it, quite often the issue is not theirs and we may be able to diagnose it.