Thanks so much for your feedback!
I think a reply button would make it alot easier, this is one thing that will be added in the future but you can currently click emails to copy them to your clipboard (this is probably not at all obvious)
As for the ######## individual, they definitely have a wider story planned along with the hacker group. they basically act as the starter quest right now, giving you an easy task to get you started in the game.
I will definitely look into the scale of the desktop apps, these may have been overlooked when i did the scaling update. (oops!)
Again, thanks for playing and i will be sure to check out AstrOS!