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Allow from anyone
off => Signal will only allow sealed sender
messages to go between accounts that have already established trust, particularly by being in each others' contact lists. If you block someone Signal has made cryptographic tweaks so they will still be barred from messaging you—even if you are in each others' contacts.Allow from anyone
on => an attacker sitting inside the service will only see encrypted messages going to their destinations, and won't be able to see where they came from. Display indicators
on => a status icon to indicate messages which have been sent using the scheme