The Defaults page contains the most basic elements of the Mailbox and how New Emails are started.
Default Format: There are three email formats to choose from for new e-mails. Select the option that fits your needs. Remember that no matter what you set here, Reply and Forward will always be in the format the message was received in.
Default Mailbox: Select the Mailbox that should show first in the E-mail Panel. This will also be the Mailbox that is selected to send from when a New Mail message is created. This is typically set to the User's primary e-mail address, though if this person is a customer service agent, for example, they might have their default mailbox set as the "support" mailbox, so that new messages are sent from support.