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multiple message destinations
>Are there other ways to handle sending to multiple receivers?
1) You can send it to a service which copies the message and resends
it as many times as you need. Or send it yourself.
2) You can have the multiple recipients each share a key and let them
trust each other. (Not recommended for the paranoid).
3) You can use a secret sharing system which is tied to a private key,
such that revealing the secret allows for the derivation of the
private key. The secret itself is a different private key. (I'm not
up on the details of these schemes.)