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bill - 1:45 am on Sep 28, 2011 (gmt 0)
From [google.com...]
Feedfetcher does not follow robots.txt guidelines.
If your feed is publicly available, Google can't restrict users from accessing it. One solution is to configure your site to serve a 404, 410, or other error status message to user-agent Feedfetcher-Google.
It's understandable that you don't want to lose the subscribers. Maybe adding a large eye-catching image to the Please unsubscribe message might draw more attention.