Hi Sam,
smtp.secureserver.net seems to be the most usually successful smtp setting.
Did you also try changing line 9 in your WA_Universal_Email/WAUE_contact_1.php file too? From:
$MailFrom = "".((isset($_POST["Email_address"]))?$_POST["Email_address"]:"") ."";
to
$MailFrom = "web@mydomain-name.com"; /* (the bit before the @ can be anything, the mydomain-name.com is obviously the name of the domain you're sending from)*/
Some hosts won't allow mails to be sent from email addresses that aren't from their own domain. CFSP by default sends from an adress entered in the email field of the form, which could be anything. Changing line 9 of WAUE_contact_1.php forces an acceptable 'From' address.
and line 15 from:
$WA_MailObject = WAUE_Definition("".($WAGLOBAL_Email_Server) ."","25","","","","");
to
$WA_MailObject = WAUE_Definition("".($WAGLOBAL_Email_Server) ."","80","","","","");
which just forces port 80 instead of 25
Also check the the sent email isn't being filtered as spam somewhere along the line.