Some people post without a proper configuration of their newsreader.
Most people do not give a host name, some even post without even giving their user id. And those people even wonder why noone responds to their posts. I usually try to tell these people, but for that I have to find out the correct email address. This process I still do manually as there are too many special cases to hack a script. Notify user by sending him the correct email address Ask user to change the setup of his newsreader As you can see, it takes a bit of time to do this.