When emailing test results it is sent through port 25 on the end users machine. It looks like from the error message that the end user has a firewall configured on their machine that is blocking port 25. This port would need to be opened.When emailing test results it is sent through port 25 on the end users machine. It looks like from the error message that the end user has a firewall configured on their machine that is blocking port 25. This port would need to be opened.