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Police shut more than 14,000 accounts on Mega, Tutanota and Protonmail
(therecord.media)
This is a most excellent place for technology news and articles.
Yes, the "to address" cannot be encrypted as it is necessary to deliver the mail, the "from address" are needed to send a notification when the "to address" doesn't exist.
Technically, the "from address" probably can be encrypted, like in signal; but I think it is required in the current email standard.
Thank you. This helped.