How to Block Outbound Email to Untrustworthy Domains or E-mail Address for specific people ?

TECHIT SRIWICHAI 160 Reputation points

I want some User Not All tenant within my organization Can't to send emails to domains such as or emails Outside organization Can customizable Please advise. 

How do I need to create a Can you please show me a sample Mail Flow?

Example : i have User E-mail User1@ test . com My organization

i need Block send E-mail Domain: And E-mail : techit @ TTT . com

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