[wilsonnb3]

How are you going to reach out to someone first if all communication is blocked because they don't already know you?

[miloignis]

Ah, I should have elaborated a bit more - the strict solution is out-of-band only, namely in person or allowing contacts-of-contacts to reach out.

I think practically you'd want to be able to create time-limited, otherwise uncorrelated invite tokens/addresses that you could freely give out and deactivate later.