Looking at the documentation on the Ipower Site, it looks like they do not support the standard php mail object.
it looks like will only support the Pear Mail for SMTP mail object.
on the server behaviors tab, double click the universal email server behavior.
in the universal Email server behavior, click the Envelope Icon to go to the Email serer Settings, Change the mail Object to use the Pear Mail for SMTP
you may need to enter a user name and password to access the smtp server.