I'm not completely sold on the argument that software should aways fill the user's screen. Many websites, for example, don't use the full width of the screen for text, and I think I personally like it that way because I don't have to sweep the entire screen to read. Screens are landscape, rather than portrait like books, so it can be annoying to read overly wide lines of text.
I got so fed up with Outlook that I surveyed the bigger half of the office population to find out the outbound server and switched to Thunderbird under a linux vm. Not sure whether it helped with the keyhole problem tho.
Thunderbird is by far the best MUA I've used. I use a Chromebook as my daily workstation and I cannot wait for it to support Linux applications so I can run Thunderbird rather than my current situation (a mix of web-mail and ALPINE).
It requires disabling a fair amount of the benefits of a Chromebook to enable. Yes, I have tried it. Also, the method it uses to display X11 applications is fairly terrible.
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[ 2.7 ms ] story [ 37.0 ms ] thread[1] https://ritchielawrence.github.io/cmdow/
[0] https://github.com/dnschneid/crouton