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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
In the Mail app
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 Contact.
The Blocked icon
appears next to the sender’s name in the message list and a banner is added to their messages to indicate they’re blocked. The banner also provides a link to the Blocked pane of Mail settings, where you can manage blocked senders.
You can also add senders directly to the list of blocked senders. Choose Mail > Settings, click Junk Mail, then click Blocked.
Unblock senders
In the Mail app
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 Contact.
You can also remove senders directly from the list of blocked senders. Choose Mail > Settings, click Junk Mail, then click Blocked.