in universal email, did you specify a redirect page to go to after the email is sent?
If so, do you get redirected to that page when the form is submitted?
If you are being redirected, this means that message is being passed to the SMTP server.
If you are not getting the email, This means that the SMTP server is refusing to relay the email for some reason.
If you are positive that the SMTP server settings are correct, some common things to make sure of are:
1) Make sure the From Address is a valid address for your domain.
2) In the SMTP server settings section of universal Email, check the option to pass the From Address as an extra parameter.
if the email is still not being delivered, contact the host and ask if they can look into the SMTP server error logs to see why the email is not being relayed.