Delta Chat on Nostr: npub1exxa2…fr4we whether a message is end-to-end encrypted or not can be seen by ...
npub1exxa2h3rgk5zx334dk37htjj9wdqls3nulkym9p7w5n4ndmdww9q8fr4we (npub1exx…r4we) whether a message is end-to-end encrypted or not can be seen by the "padlock", see https://delta.chat/en/help#whene2e -- is the other user using an OpenPGP-capable app?