How do I get Thunderbird to STOP automatically deleting a whole list of received emails that I have not had time to read. Some of them I have read or at least seen on my I Phone, but a lot of them I would have to have time to read the whole thing and can't with my I Phone as I am usually at work so I wait to view them again on my computer at home when I have some quiet time. As soon as I open Thunderbird the list is visible and when it updates the whole list that was there is gone leaving only the couple of that days incoming mail.