The tables used by this part of the program are these The first is the email and attachments tables, which are memory tables, gone when the program is closed.
The next table is the Spam and Friend table. You may modify this at will.
There is a NotSaved table, which lists messages deleted from the server but not saved in the email database. This gives the email address and the time of the email. Messages earlier than 30 days ago are deleted. You may change this number, or set it to 0 which means it is never deleted.
