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Hushlist

Hushlist is a program which allows communicating via Hush transactions. You can send messages to around 50 people simultaneously, allowing for encrypted mailing-list style messaging.

Hush is a fork of Zcash (which is a fork of Bitcoin), which allows transactions involving shielded addresses in addition to normal transparent Bitcoin addresses. This allows transactions without disclosing sender, receiver, message (or even that a message existed), or financial transaction amount.

Hushlist supports Hush and Zcash (mainnet and testnet). Komodo will supported in the future, although it's not clear yet which versions.

Messages are encoded within the protocol that Hush uses (Zcash). This allows several important things to happen.

The type of traffic is obscured. A man-in-the-middle attack cannot tell if a transaction is a financial transaction, a conversation, or both.

The conversation is encrypted within the blockchain protocol itself, rather than being encrypted as a separate piece. Because the (encrypted) message is publicly posted with the blockchain this guarantees a specific thing was said at a specific time to a specific person or group of people. All anyone needs is the key to unlock it.

Keys are tied to a specific send/receive address. You may create as many addresses as you like as often as you like, similar to creating email addresses.