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.Message 'cannot be found' errors - When attempting to move or delete messages, you may see a warning that the message cannot be found.However, it may stubbornly show up in your inbox again, sometimes after quitting and relaunching Mail, or when switching back and forth between mailboxes. Deleted messages reappear - If you remove a message from your inbox, either by deleting or moving it to a new mailbox, then it should disappear.

Most of the time Mail will allow you to properly interact with your messages however, there are times when it can improperly manage messages and give you some odd behaviors. Apple's Mail application in OS X offers a built-in option for managing e-mail from a number of services, including standard POP and IMAP accounts, as well as services from specific providers like Google, and Yahoo, among others.

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