in the Universal Email behavior, Make sure you are using the correct SMTP server for your host. In the SMTP Server settings, you may also need to check the option to pass the from address as an extra parameter.
Also, make sure that the From address you entered is a valid email address for your domain.
If you continue to have a problem, please send a copy of the contact page, and the webassist/email folder so i can see the code. I will also need to know who the host is.