We know how important it is to maintain control of your RSS feed and your subscribers. If you create your podcast with RSS.com and activate a redirect from your old Simplecast rss feed to your new rss.com feed you will not lose any subscribers.
Important: If you have multiple podcasts on your Simplecast account you will need to individually redirect each feed.
Log in to your Simplecast account
Drop down and look for "Distribution Settings"
In "RSS Feed" look for the "Advanced Settings" section
In the section "RSS FEED REDIRECT" paste your RSS.com feed