If you are still having issues, or Mail fails to launch, you should try a manual reindex.

Now that you've completed these steps, work with Mail a little longer. While the process takes place, you may experience system performance lag, as it can consume a lot of system resources and memory.Īnother caveat, if you use IMAP or Exchange with any of the accounts, the process will redownload every message from the server, so you'll use a lot of bandwidth. You must repeat this step for each one of your Mailboxes. If you have a large mailbox, you can expect the process to take a few hours. At the bottom of the pane choose the Rebuild option. Launch Mail, select one of your mailboxes and click on the Mailbox menu. Rebuilding a Mailbox in Mail sound daunting but it really isn't. Now you've done that, we may be able to improve things using these two tips:

Delete messages inside your Deleted Items and Spam folders.

When they do, Mail's performance will suffer and you'll find that even something as simple as downloading new messages takes an age.

Mac users depend on Apple Mail for day-to-day email use, but as those messages come in and go out your Mailboxes will become bloated.

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