Have you been using Apple’s Mail.app for a while, and the size of the stored mail is simply increasing with no end in sight? You can tell Mail.app to not store attachments locally, delete the mail, and re-download just the text content. Assuming you can use the Terminal a bit, here’s how:
If you set up Mail.app in OS X to download attachments for an IMAP account, and then later decide you do not want to store a copy of each attachment locally, you can change the account settings so that only the headers are downloaded. You can make the setting in Mail.app Preferences, but, it takes a while to synchronize. Sometimes a good looong while.
Assuming OS X 10.5.5 and that all your mail is already up on the server, first, set “Keep copies of messages for offline viewing” to “All Messages, but omit attachments” in Preferences, Accounts, Advanced.
Next, shut down Mail.app, to get it to release the folder we’ll now work on. Then bring up a Terminal,
cd into the appropriate IMAP folder and confirm and delete the contents using the
rm command (again, this assumes you have the mail up on the server already):
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Before you delete, check what is in there using the
ls command, and the size of the folders using the
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Next time you restart Mail.app, it will rebuild the folders it needs, under your IMAP folder.