Choose Open Mailbox from the Mailbox menu.
Choose one of the following items in the submenu:
Inbox - The mailbox where you receive email by default
Sent Mail - The file that contains your outgoing messages (HomeDirectory/Mail/sent.mail by default). This item is active only if you have saved outgoing messages in this file.
Select Mailbox - A mailbox that you specify from the File Selection dialog box
Other Mailboxes - One of the mailboxes in the default mailbox directory
The mailboxes that you opened, or moved or copied messages to previously in this Mailer session