
Block or unblock senders in Mail on Mac
If you don’t want to receive email messages from a specific person or group, you can block them. If you change your mind later, you can easily unblock them.
Block senders
- Go to the Mail app  on your Mac. on your Mac.
- Select a message from the sender you want to block. 
- Move the pointer next to their name in the message header, click the arrow, then choose Block Sender. - The blocked icon  appears next to the sender’s name in the message list and a banner is added to the messages in the list to indicate they’re blocked. Click Manage in the banner to access the Blocked Contacts pane of Mail settings, where you can manage blocked senders. appears next to the sender’s name in the message list and a banner is added to the messages in the list to indicate they’re blocked. Click Manage in the banner to access the Blocked Contacts pane of Mail settings, where you can manage blocked senders.
Unblock senders
- Go to the Mail app  on your Mac. on your Mac.
- Select a message from the sender you want to unblock. 
- Move the pointer next to their name in the message header, click the arrow, then choose Unblock Sender.