[kogir]

Yes, and highlighting a failing in email that cannot be fixed, but which is addressed in other services where confidentiality is desired.

[kevin061]

Email is not remotely comparable to Signal.

Email is a free, open source, strictly defined and consensual decentralised protocol.

Signal is a source available app and server that is not decentralised and represents a walled garden. Signal is centrally controlled by OWS.

[ramon156]

In the context of sending something.

No need to get pedantic