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FeedBurner is well know for doing this. For example https://feeds.feedburner.com/GoogleAppsUpdates https://feeds.feedburner.com/GoogleAppsUpdates

• mkr-hn 5y ago
  I know it used to be that, but it looks like an ordinary HTML web page now.
  • kevincox 5y ago
    Hmm, I swear that I viewed source and saw XML but you are right. It is definitely just HTML now.