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How do I change or add to the Apple Mail RSS preference to retain messages for three days? The default choices in the pull down menu are 1 day, one week, two weeks, etc. Do I need a terminal command?

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From my own testing, it appears that the setting RSSAutoDelete in ~/Library/Preferences/com.apple.mail.plist controls this feature. Try running the following command in Terminal.app:

defaults write com.apple.mail RSSAutoDelete -int 3

The GUI settings are "Manually", "after one week", "after two weeks", etc., which appear to correspond to the values 0, 7, 14, etc. It's a reasonable guess that setting it to 3 might make Mail.app delete messages after 3 days.

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