Tutanota and all the other privacy focused email providers may be focusing on the wrong threats. It is a bit like the Maginot Line--impregnable, but the enemy goes around it. Every study shows that the biggest email threat comes via phishing and other human engineering attacks. One reason Gmail scans your emails is to prevent spam, phishing, and other attacks and it is quite effective at that. The contrast has been stark when I have tried other smaller email providers (I have not used Tutanota)--the flood of unwanted spam and dangerous email comes pouring in, which I don't get using Gmail and Outlook.com.
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