Currenlty the service is hosted by three virtual server in order to increase the uptime.
Update April 2011: The mirror-service for load balancing started on April 26th 2011. The server is located in Chicago, USA. If you want to access the mirror server directly please contact me. If you access check.block-disposable-email.com the two existing servers will be queried alternately without the need of changing anything.
Update June 2011: An additional mirror server is online. No changes needed on the client side.