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If the security is achieved by sending a link to the content that is then sent over https when the recipient requests the content of the message, then one can just put the content on any web server, such as Fastmail's files storage, and send a link (that can be protected with a password).
Of course this kind of privacy protection protects the sender's privacy at the expense of the recipient's privacy, as the sender can know that the recipient has accessed the message, when the recipient accesses the message, from what IP address, and usually other stuff such as what browser etc.
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