Click the Mailer control in the Front Panel.
When you start Mailer for the first time on your system, it looks for a local or remote Internet Messaging Access Protocol (IMAP) mailbox in your email setup.
If the setup does not indicate the type of mailbox you have, Mailer prompts you to specify the mailbox type.
If the setup indicates that your mailbox is local, Mailer opens your Inbox (which usually resides in the directory /var/mail/username).
If the setup indicates that your mailbox is remote, Mailer opens the Mailer Login dialog box so you can log in to the IMAP server.
After Mailer starts, the mailbox is displayed, along with message headers and a view of the selected message.