FairEmail
I have used FairEmail on Android for Fastmail and also for Polarismail and I have had great success. I even find FairEmail to work better than Fastmail's own app. It has a free and a paid version. It is a little complex, but learnable.
GMX's app works very well for me.
I really do NOT like GMail's app at all.
Tutanota's app eats battery on my smartphone and does not update the badge frequently enough. I have not optimized battery, though I am going to try it. Tutanota's email is good for a free secure service, but it is a little rudimentary compared to others.
I do not find Protonmail's app to update frequently enough at all as in 6 hour delay from email receipt to notification.
Just my two cents.
Cheers !
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