Whitelist/Blacklist domain or email address in Office 365

This is how to : Whitelist or Blacklist domain or email address in Office 365

1- use the following link :

https://security.microsoft.com/antispam?tid=4fd1889c-08d5-4339-8c6f-a02bda15a3c5

2- Select Anti-spam inbound policy (Default)

3- Select Edit allowed and blocked senders and domains

4- To whitelist Sender or Domain – select Senders or Domains under Allowed

5- To Block Senders or Domains – select Sender or Domain under Blocked

6- Continue tile you select Done