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1. There is no form of encryption. This alone makes it obsolete garbage. Absolute shit useless garbage. Absolutely no, single fucking one should be able to read a message you send except the recipient period. This is already solved plainly for websites.

2. There should be a method for modifying emails you've already sent. It's fine that they obviously will be able to see past revisions. But not being able to edit at all is a complete deal breaker. Emailing is complete garbage because of this.