Hi. I am getting a problem which I know is a configuration problem. I have a 'Send Email' workflow which works fine locally, where I have my email configured to use gmail as shown:

    <mailSettings>
      <smtp from="website@<mydomain>.com">
        <network host="smtp.gmail.com" userName="me@<mydomain>.com" password="<mypassword>" port="587" />
      </smtp>
    </mailSettings>

However, when I try to run on the hosted server, which apparently should use an open relay available on the same network, and DOE NOT REQUIRE AUTHENTICATION I use the following details which do not work:

    <mailSettings>
      <smtp from="website@<mydomain>.com">
        <network host="mail.<mydomain>.com" userName="" password="" />
      </smtp>
    </mailSettings>

There is a single error in umbracoLog, stating, helpfully, "Object reference not set to an instance of an object."

I can't check the SMTP logs from the server because I don't have access to it. I also can't try to telnet to that SMTP server because I am using a plesk control panel and can't access it from outside the network.

Any ideas? How should I configure mailSettings correctly if my SMTP server DOES NOT require authentication?