Set Delay on Mark Mail as Read in Mac Mail

Close Mac Mail, and open Terminal and copy paste in the command below, eding the 0 to the number of seconds of delay you’d prefer, like 5 or 30. Hit enter and you’re done!

defaults write com.apple.Mail MarkAsReadDelay 0

To go back to the default, mark read immediately:

defaults delete com.apple.Mail MarkAsReadDelay 0

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