pear mail is just an interface to connect to an SMTP server that you specify.
It will connect to the SMTP server and hand off the email message to be sent.
Once the email message has been given to the SMTP server, the SMTP server will deliver the message.
In Universal Email, you will need to specify a valid SMTP server address.
your from address should be an address that exists on the same domain as the SMTP server.
If the SMTP server requires authentication, you will need to provide the correct username and passworrd.