You can block unwanted messages from specific senders in Mail on Mac.
Follow these steps to block receiving messages from specific email addresses using Apple's "Mail" program on Mac. Note: if you accidentally block the wrong person you can reverse this action.
Follow these steps...
Display a message from the person you want to block. Move the pointer over the sender's name in the message header. Click the small down-arrow at the right of the name. Choose "Block Contact" from the pop-up menu which appears. You should see an area above the email saying the user has been blocked. You can click "Settings" here to specify what to do with blocked email (see below).
To reverse this, find a message form a blocked user, then use the same steps, except the option to block should have changed to unblock.
If you have one or several email address you want to block but don't have messages from them, you can block them using another technique. Note, the addresses need to be in your contacts list, so put them there first (even if you don't want messages from them; seems odd, I know).
Click the "Mail" menu, then "Settings". Click "Junk Mail", then the "Blocked" tab. Make sure "Enable blocked mail filtering" is ON. Choose how to deal with blocked users... Either choose "Mark as blocked mail, but leave in my inbox", Or "Move it to the bin". Click "+" to add an address which is already in your contacts. Click on an address, then "-" to remove it from the blocked addresses.
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