All RSS feeds generated in RSS Ground and that start with http://www.rssground/.. are guaranteed valid. We follow all the official requirements for RSS feed formatting. To make sure the RSS feed is valid, please refer to the official RSS feed validation service.
Some feeds from other content providers may be not valid. Invalid feeds may not properly work in RSS Ground or any other third-party tools. Unfortunately, we don't have control over such feeds and you have to contact original content providers regarding any problems with their RSS feeds.