MESSAGING_EMAIL_CACHE_REFRESH_FOLDERS Messaging Endpoint
  /rpc/messaging/?method=MESSAGING_EMAIL_CACHE_REFRESH_FOLDERS  
  Click here to read a summary of Email Caching. When you first connect to an email account, it automatically loads in all the folders. You can see these via MESSAGING_EMAIL_CACHE_FOLDER_SEARCH. If the folders change, you can call this method to resync them.  
  PARAMETERS TYPE NOTES
  Account Numeric Mandatory. Id of the account
  RETURN