Hi there I'm hoping this is the right forum to post in. I am trying to test whether my router is correctly allowing me access to port 25. Is their a way of forwarding port 25 to my Mac laptop and using it for something in order to test it. What I'm actually trying to do is set up a mail server on my Synology Diskstation but I figured I might get somewhere if I first tested whether port 25 works on another device. If it does then the problem is with my diskstation. I'm also have problems with port 5019 but many other ports I've set up in the same port forwarding rule to my diskstation are fine. I'm running OS X 10.8.4 mountain lion on a Macbook air. My internet provider is plusnet and the router is a Thompson TG582n. I do have 2 other routers but I've not been able to get them to connect to plusnet, despite not be locked down.