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Amazon needs to check its IPs against the blacklists before releasing them back into the AWS pool.

Seems like this points to a longer term problem with blacklisting by IP address as they continue to become more transient with respect to the hosted service.

There's a similar problem with some API providers like Twitter throttling usage from App Engine and EC2 IP ranges: http://news.ycombinator.com/item?id=793939

Let's not rush to judge Amazon. It's not clear this is an IP address issue. This domain name has a questionable history:

http://web.archive.org/web/20070127212047/http://workstax.co...

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