Banning emails from a spammer

Can someone tell me if I can ban a certain person from sending email to a certain domain that is on my server? Someone told me that I can only do this by banning them on the entire server. Is this true?

Example;

User@domain.com is sending emails to one of my clients but this client does not want them.

However a different client of mine does want email from User@domain.com.

How do I do this?

KennyBanning emails from a spammer

 

 

 

 

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