I've see that in use. For example, you may be accessing a web interface for configuring a device.
Most likely in your manual, not inside a e-mail. Can we close this thread? Its silly.
It's silly to attack people trying to help.The point of this thread is to brain storm issues with a new list.
IMO, he makes a good point. I've seen and used http://10.10.10.1 and http://192.168.1.1/, etc. We can probably just whitelist the 10.X and 192.168.X.
Regards KAM