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RSS feeds including recently edited Collection items

We have an RSS feed here: https://www.mynd.co/knowledge-center/rss.xml which displays newly added blog posts. The problem is that it also adds a post/item, each time a post is edited. None of our readers care about old posts which have been edited. They only want to see new posts, as they are added to the site.
Is there a way to stop showing edited posts?

thanks everyone :slight_smile: