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Yahoo Error: "RETR command did not succeed"

If you have a Yahoo! mail account set up in Postbox and you cannot get new mail because you receive a message saying "The RETR command did not succeed. Error retrieving a message. Mail server pop.att.yahoo.com responded: problem retrieving message." then try the following:

  1. Quit postbox
  2. Log into the Yahoo webmail client
  3. Empty your Spam Folder
  4. Restart Postbox and attempt to get new mail