pownce blocks/throttles access to feeds

I tried emailing this but no reply, so will try this path..

I run a site called twitterfeed.com which lets users post RSS updates to twitter. As far as I can make out, pownce blocks requests to pownce RSS feeds coming from my domain (just a simple wget from the domain times out, while from other machines it always works).

I had a similar issue with del.icio.us, who have now helpfully whitelisted the twitterfeed.com domain/IP addresses - any chance someone at pownce could take a look at this, and hopefully do something similar?