"Email is simply not secure. Messages are not secure in transit: the protocol used for sending email (SMTP) does not require encrypted connections, so it could easily be intercepted by a third party as travels over the internet. You also have no guarantees about the security of a recipient’s email client or server. A hacker could have surreptitious access to a recipient’s inbox, or curious IT guy could be reading through email on the server."
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From the post itself:
"Email is simply not secure. Messages are not secure in transit: the protocol used for sending email (SMTP) does not require encrypted connections, so it could easily be intercepted by a third party as travels over the internet. You also have no guarantees about the security of a recipient’s email client or server. A hacker could have surreptitious access to a recipient’s inbox, or curious IT guy could be reading through email on the server."