I got this idea when the news server of my ISP went down so I started searching for public servers. Sometimes if a particular server is down you might not be able to access it. Moreover there are servers that allow access to people from some regions only, so while these listings might work for some of you it might not for the others.
Kindly email me if you know of any other public news servers or if you find any incorrect info here. Currently I am using 206.136.168.3 which allows postings. My thanks to all the people who keep sharing their findings with me.