Open Messaging
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Select Options > Settings > E-mail.
To create or edit mailboxes, select Mailboxes > Options > New mailbox, or open an existing mailbox from the list.
To change the mailbox used by default for sending e-mail, scroll to Mailbox in use, and select Change. Select the new mailbox.To change the mailbox used by default for sending e-mail, scroll to Mailbox in use, and select Options > Change. Select the new mailbox.
To change the mailbox used by default for sending e-mail, select Mailbox in use and the new mailbox.