NotePreference represents the priority of destination servers. The lower
                                             the preference value, the higher the priority.
                                           
                                          
                                          Optionally add multiple destination servers for one recipient domain
                                             or email address.
                                           
                                          
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                                       NoteTo disable a destination server, click the check mark for the server
                                             in the Enable column. Then the check mark becomes a
                                             cross mark. To enable the server again, click the cross mark.
                                           
                                          
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