You can use Do-more Logger to help troubleshoot. To enable, turn on ST36 ($EnableMsgDump), and change the value in DST61 ($SysMsgLevel) from 1 (meaning only give ERR) to 2 (meaning give both ERR and MSG). Then go to the Launchpad and in the Applications window double-click on "Do-more Logger." Once this is done, and your EMAIL instruction is executed, you will see meaningful messages displayed in the Do-more Logger window that will help you see exactly what is happening with your EMAIL and the Email Server it is attempting to connect to.
When you are finished troubleshooting don't forget to set DST61 ($SysMsgLevel) back to 1, and turn off ST36 ($EnableMsgDump).