Removes deleted IMAP messages from the Message list, but does not purge them from the server.
To show deleted IMAP messages until you purge them from the server, clear this check box.
Click to change the character set applied to messages that don't specify one.
Type the number of seconds you want to view a message in the Preview pane before it's marked as read.
Marks a message as read after you view it in the Preview pane for the number of seconds you specify.
Marks a message as read when you view it in the Preview pane.
If you clear this check box, messages are marked as read only when you open the message, or select the message and then click Mark As Read on the Message menu.
Click to close the message window or open the next message after you move or delete an open message.