

This will clear the current index for the selected mailboxes and then read through your messages to rebuild it, so it may take some time, but when complete, it should give accurate information about the messages in the mailbox. To rebuild the index, select your desired mailboxes by holding the Shift or Command keys and clicking them to add them to the selection, and then choose "Rebuild" from the bottom of the Mailbox menu. Therefore, if those listed above or similar errors are happening to your mailboxes, you can likely correct them by rebuilding your mailbox index. If the mailbox index is damaged, then Mail may show incorrect statistics and other data from it, and also be unable to properly access and handle the messages referenced by the damaged index. The index lets Mail know what specific files are to be read and opened when you select messages, and it also contains unread file counts and other information which is displayed as you manage your e-mail. In order to speed up message handling, the messages in each mailbox are indexed, and it is this index that is accessed for the number of messages in the mailbox, and not the messages directly. Sometimes, a problem can occur because of the way Mail manages your message organization.

These types of errors can be frustrating to deal with, especially since once they start, they sometimes get worse. The Rebuild option is available at the bottom of the Mailbox menu, once you have selected at least one mailbox. Incorrect message counts - Mailboxes may show incorrect numbers of total messages, or incorrectly report the number of unread messages even if the total is correct.Blank mail messages - If you locate some messages and attempt to view them, either by clicking or double-clicking, Mail will only show you a blank message, with no content, header, or other information on it.

