如何从RFCOMAPI发送RightFax邮件

以下是我目前的内容:

var faxserver = new FaxServerClass
                    {
                        ServerName = "{server ip}",
                        AuthorizationUserID = @"{my username}",
                        Protocol = CommunicationProtocolType.cpTCPIP,
                        UseNTAuthentication = BoolType.False
                    };
faxserver.OpenServer();
var fax = (Fax) faxserver.get_CreateObject2(@"{my username}", CreateObjectType.coFax);
fax.ToEmailAddress = "{my email}";
fax.IsINLJob = BoolType.False;
fax.EmailSubject = "Some random subject";               
fax.IsProductionFax = BoolType.True; 
fax.Send();

这段代码没有抛出任何异常，但看看faxux，直到我看到"转换传真正文或封面有问题"。我该如何解决这个问题?

不幸的是，这个产品很少有关于其API的文档。我只能找到这个链接