I am the host.
I have many, many dozens of implementations of WA Universal Email on that server and all work just fine. There is a mail server on the server and localhost works just fine for all of them whether they are in ASP or PHP.
That is not the issue.
btw initially it was ("","","","","","");
I had tried 127.0.0.1 and 25 to emulate WA Universal Email. Also tried dropping one of the quote sets as per WAUE but that did not work.