People expect their email to be private between them and the recipient, but in reality, the contents of your email are exposed during transmission. Full end-to-end encryption would mean that only the receiver of the email can decrypt their messages, but sharing public keys and agreeing on a common encryption standard can be tricky for most users.
Plus, if email communications are fully encrypted along the entire path, then there’s no opportunity for a service in the middle, such as Gmail or Office 365, to check for spam, automatically sort emails into folders, or offer full-text searches.
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