On the other hand Signal has "sealed sender", so while they know the recipient, they don't know the sender: https://signal.org/blog/sealed-sender/ https://sign

On the other hand Signal has "sealed sender", so while they know the recipient, they don't know the sender: https://signal.org/blog/sealed-sender/ https://signal.org/blog/sealed-sender/ I guess another example of why it's hard to retrofit email for security and privacy.