This seems to mainly be disigned to work within an organisation. Like Microsoft Teams or Slack

It doesn't seem to work for a "common" email use case of contacting random people at other organisations. How would I say contact a vendor and a sales guy reply to me?

Can I publish my address on my website or business card and people contact me?

Of course any-to-any connections with email (or the phone system) spend a lot of time working with the downside of "unwanted" messages/calls.