So how is it done?
A known solution to this problem is to include a special contest code into your RSS feed and not have this code visible on your website. That way each contestant will be forced to grab the code from your feed and submit the code via comments to verify that they have subscribed to the RSS feed.
Now check out the coding and step-by-step instruction from Weblog Tools Collection.
Hope this helps you out and if does do drop a comment. Thanks!
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