At least 1 post before being able to send private message?

Can I achieve this somehow? There's one guy(bot) that registers a lot of new usernames and sends private message spam. If I am able to set private messages being able to be sent after 1 post on the forum he will lose the battle. Do you have advice?

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source https://xfworld.net/threads/at-least-1-post-before-being-able-to-send-private-message.47924/