[heydabop]

That's a per-server controllable setting. The admins can set it such that only users with a verified email (and phone number if they desire) are able to send messages.

[tgsovlerkhgsel]

Yes, but if you create a new account and the risk algorithm flags you I think you may still be required to verify regardless of the server setting.

Maybe that was also because I started by signing up instead of following an invite link (not sure about that).