Mail Server = IMAP I've 'Place a copy in "Sent" Folder on: MyIMAP Account" in "Copy and Folder Setting" I found that "Send" operation very slow and more of the time even failed in copy operation to "Sent Folder" due to Mozilla need to access / open the Sent Folder everytime I send a message. I have few thousand of messages in my IMAP "Sent" folder. No such behaviour in previous version of Mozilla or Netscape 6 Mail. Is this a bug?
