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How To Fix Mail.app Message Listing

Here's a standard view on Mail.app (OS X 10.5).

Messed up message index in Mail.app

If the selected message on your message listing (showing header info, number 1 in the image) does not show up in the actual message box below (number 2), but instead Mail.app shows an another message, your index may have gone bad.

Worry not. To fix the problem, close Mail.app, (as always, make necessary backups), trash a file called Envelope Index in /Users/[your_name]/Library/Mail/, and restart Mail.app (there will be a dialogue to import your account: just click Continue). You might even save same disk space and speed up your Mail in the process! Full details (and more hints) on macosxhints.com.