If you'd like to prevent emails from being sent to specific people, you can add domains and email addresses to your blacklist. Each user has their own personal blacklist they can edit. There's also a team blacklist that only the account owner and managers and can edit. 

You can find the blacklist settings for your account under your personal safety settings and the team blacklist under team safety settings

To add multiple domains and email addresses, you can separate each one by adding a new line. 

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