Quote:
Originally Posted by zx10guy
Email is inherently insecure. When you transmit any email, it's in clear text. So where ever your email has traversed across the wild wild west of the Internet, there's going to be a signature/footprint left behind. Anyone looking to peer into your email comms can do it. This is why the guidance is to never transmit sensitive data through email. And if you do, have the contents encrypted via utilities like PGP or have files sent password protected.
As an aside, services like Gmail, Yahoo Mail, Outlook, are not totally free. Yes, you don't need to pay for the service. But everything costs money. These companies are not providing these services free out of the goodness of their hearts. They get revenue by mining your emails among other things.
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Gmail is encrypted end to end so if you email another user that is on gmail it's encrypted. They took this step after the revelations from Edward Snowden.