消息体是空白的，而通过PHP发送邮件的hotmail

除了hotmail之外，所有帐户的邮件都很好。在hotmail中，邮件正文是空白的。但是当与视图源进行检查时，消息体正在显示。请帮助我们

function Trigger_WelcomeEmail(&$tNG) {
global $DID;
$emailObj = new tNG_Email($tNG);
$emailObj->setFrom("test <test@test.com>");
$emailObj->setTo("{email}");
$emailObj->setCC("");
$emailObj->setBCC("test@test.com");
$emailObj->setSubject("Smile! You Were Successfully Registered for test.com");


$emailObj->setContentFile("welcomeUS.html");

$emailObj->setEncoding("ISO-8859-1");
$emailObj->setFormat("HTML/Text");
$emailObj->setImportance("Normal");
return $emailObj->Execute();
}