I use Mountain Lion.
How do I prevent Mail.app (6.0) from marking a message as read automatically, just because I have looked at it in the preview pane?
MacOS – How to stop marking mail as read caused by looking at the preview pane
macosmail.app
Related Solutions
Go To Mail -> Preferences -> Junk
When junk mail arrives, say: Perform Custom actions
Click on the Advanced button at the bottom, which just turned up to be active.
Then say "Mark as read" in one of your actions:
Press ⌥+backspace to delete the message. No other message will be highlighted.
Warning: This deletes the selected message(s) permanently.
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Best Answer
You can change the mark as read delay to a great value, for example 30 seconds, by typing the following in the Terminal:
(NB: A value of -1 will disable marking as read from Preview if the preview window is hidden. Tested on Mail 5.2/OSX 10.7.4)