Casio EM-500 Mobile E-mailer V.1.0 - Manual (Page 18)

Mobile E-mailer User's Guide -Page 18 -
and hold the name of any condition name and then tap Restore on
the shortcut menu that appears. This returns the conditions to the
configuration they had when you originally displayed the Receive
Mail Settings screen in step 2.
l Restore works only one way, restoring previously saved
configurations. You cannot use Restore to undo a previous
Restore operation.