What are the correct TfsJobAgent.exe.config Settings for using GMail

Question

Based on my previous question, it appears that I need to enter the SMTP server information in the TfsJobAgent.exe.config file when using a non domain-joined email server.

In our case I would like to use GMail as my mail server.

I current have these settings:

   <system.net>
     <mailSettings>
        <smtp>
           <network
              useDefaultCredentials="true"
              enableSsl="true"
              host="smtp.gmail.com"
              port="587"
              userName="user@gmail.com"
              password="some password"
            />
        </smtp>
     </mailSettings>
   </system.net>

However, with these settings, I get the following inner exception message in the application event log:

Exception Message: Unable to read data from the transport connection: net_io_connectionclosed. (type IOException)

Are there additional attributes I need to set when using GMail as my email server for TFS 2010?