The messenger apps, such as BEECHAT, don't store data on-chain. Email probably falls into a similar boat. Since they're meant for a small group of recipients, publishing email messages to a public decentralized database may not make sense.
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That is true although I am not sure they are referring to onchain storage. Perhaps they are.
If so, I am not sure why they would want that. I can see the need for something that is immutable and away from the likes of Google and Yahoo. But there are emails such as protonmail which offer a greater degree of encryption.
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