>As for the metadata, no metadata is leaked that signal does not also leak.
Signal does not leak to third party servers with whom I talk to. There's encrypted comms to the server, and that's it. I try to talk to someone who has gmail account, Google now has access to 100% of my metadata with that contact. I trust Signal more than I trust Google with my metadata.
Also, there's precedent from TWO court cases Signal doesn't collect your metadata. Show me one email vendor that has such real-life proof about not collecting metadata about their users.
Metadata is leaked only to your server and to the server of the person that receives the email, just like signal. The only difference is that with email you get a maximum of 2 servers while with signal you get one.
> I trust Signal more than I trust Google with my metadata.