Xml showing html code instead of rss file for some users?

I have an rss feed that for some users shows the xml file with the rss feed fine but when others go to this xml file they see the html code. I would guess there is a setting for those who can't see the rss in the correct format. Is anyone familiar with this issue? I don't know what setting to ask those who can't get the feed to change.

Xml showing html code instead of rss file for some users?
1 some of your users don't have feed readers configured in their browsers.





or





2 Your feed is not valid.





So, you should validate the feed. and find out which browsers the users with problems are using.





http://feedvalidator.org/








UPDATE feeds have to be served correctly. When you go to validate you'll get lots of messages telling you why the feed is wrong. IE feed.html will be served as an html file, yet the same file named feed.rss will be served correctly (assuming your server is configured correctly)