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Nov 4, 2013 11:18 AM in response to helloemiby hands4,A general repair to fix odd behaviours in Mail is Mailbox > Rebuild.
Have an up-to-date Time Machine or other backup before attempting any major software updates or rebuilds.
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If that does not work then reinstalling the Mail program may help. Unfortunately that requires a reinstall of OS X.
Reinstall the OS. If your Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade.
Before you start the reinstall use Disk Utility from the recovery partition to Repair Disk on your system volume. Run it twice. If it does not finish normally the second time then do not reinstall. http://support.apple.com/kb/PH5836
Also before you start the reinstall have a backup of your data, preferably two of them (since Time Machine can fail during a restore). Most likely you will not need this but it is prudent to have an up-to-date backup before performing any major software changes. https://discussions.apple.com/docs/DOC-4055
Using Time Machine and Bootable Clones: http://pondini.org/TM/Clones.html