Just don't try to annotate the screen (or let a viewer do it). I ended up with a blank screen over everything (even the task switcher) and no way to quit. Fortunately I had a keyboard shortcut to launch a new terminal, so used that then typed "killall zoom<enter>". It worked :D
Mail spring is great. Easily handles multiple emails and in addition to traditional imap will user the google api integration for your google mail accounts. You can mix and match account types with one view into all your mail. Or filter your views easily. The click and open tracking can be turned off so it is optional and is not even available in the free version.
