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People like to say "email leaks metadata" but consider this: Delta apps do not store group metadata (memberlists, group names, avatars, keys) on servers. By comparison,

- #matrix stores group metadata unencrypted on home servers and replicates it to other federated matrix servers

- #signal stores encrypted group metadata on Amazon cloud servers

#deltachat uses a #p2p messaging model for encrypted group metadata where servers function as transport only.