Did Mavericks break Mail?
Q Since installing the most recent OS X update, Mail seems to crash when opening certain messages. And even when it doesn’t crash, it doesn’t seem to want to quit properly. Sure, I can Force Quit, but that doesn’t seem like a good long-term solution. Is this a known problem with the Mavericks update and is Apple working on it? Jacques Landragin
A It doesn’t seem to be. Or if it is, the conditions required to trigger it must be fairly specific. I think it’s more likely that your Mail indexes or the sandbox folders have got corrupted. Make sure your Time Machine backup is up to date (just in case) and then in Finder, click Go > Go to folder… and enter ~/Library/ Mail/V2/MailData. Trash any folders there that begin with ‘Envelope Index’ or ‘ExternalUpdates.storedata’. Restart Mail to rebuild these files. If that doesn’t help, try moving ~/Library/Containers/com.apple. mail to the Desktop temporarily and then ~/Library/Containers/com.apple. MailServiceAgent. Restart Mail after moving each one.
If the first one doesn’t fix things, move it back from the Desktop to ~/Library/ Containers and overwrite the new copy of the folder that has been created. If the crashing problem goes away, you’ll find you’ve lost some of your settings, but you can recreate these and then simply delete the corrupted folders you moved to the Desktop.
Trashing these files forces Mail to recreate the indexes for your emails.