How to not allow registered users to comment without logging in?

Currently, if users are registered on the website, they can post their comments without even logging in, using only their email address. In this way the avatar of registered users will be shown on the site. If an (anonymous, not registered) user knows their email address they can post a comment using their avatar like a registered user (or admin).

Is there no way to allow registered users to post comments without being logged in? error attention? or somehow?

Registered and unregistered users on my site may be able to post comments. There is no way to keep all comments in moderation, or to require all users to register. Thank you

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