How can multiple registrations be prevented?

[Robert9]

Unfortunately, I have yet to receive an answer to this urgent question of mine. What happens when people register for the second, third, or fifteenth time?

Do they receive a message saying: "Hey, you already have an account here, it starts with 'Ab...' and the email address starts with 'ab...'."

Please use your old account and do not create a new one! We do not want that here! If you cannot access your old account or have significant reasons for creating another one, please contact...

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How can multiple registrations be prevented?

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