TB 为什么老是重复收信

之前还很正常，最近一阵子 老是重复收到以前的邮件？
这是怎么回事？
谢谢

http://kb.mozillazine.org/Duplicate_messages_received

To avoid receiving further duplicates

There is no sure-fire method to ensure that you will never receive duplicate messages again, but below are some things you can try, with the easiest options listed first.

    * Set Thunderbird to delete messages from the server: go to "Tools -> Account Settings -> Server settings", and uncheck "Leave messages on server."

    * Compact your mail folders on a regular basis.

    * Compact folders, exit Thunderbird, and go to your mail folders (in your profile folder). Delete the index files, named "*.msf" (such as "Inbox.msf"). These will be rebuilt when your launch the application again. (You should not need to do this on a regular basis, however.)

    * Try deleting the popstate.dat file from the account subfolder in the "Mail" folder in your profile folder. If "popstate.dat" gets corrupted Thunderbird can get confused about what has been downloaded. (Note: if you delete "popstate.dat" and you still have messages on the server that have already been downloaded once, they will all get downloaded again.)

    * As a last resort, you can try creating a new profile, setting up your accounts in it, and then migrating your mail and address books over from the old profile.

    * If you share your mails with Windows/linux viaThunderbird (prefs.js tip), and you always get the leaved message again, ensure you've removed all the relative paths in the prefs.js you've modified.

Of course, if you try deleting files or making a new profile, it's wise to first make a temporary backup of your mail and settings.