To mark your messages read or unread you need to:

  • Open your mailbox.  

  • On mail list to the left, under the search field, click on the bulk option.

  • Then you can select all the messages that you intend to mark them as read or unread.
  • Then choose mark as read, or mark as unread.

  • You can also choose to delete your mailbox history. (Please take into consideration if you chose to delete your mailbox history there will be no way to restore that again.)