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The site, the Open Relay Blocking System (ORBS), which provides an automated way of blacklisting third-party email servers that spammers use to send mail, was shut down yesterday. Many email servers by default are open to third-party relay, which spammers use to hide their tracks. Using the ORBS list, ISPs and other email providers can choose to block messages from the offending servers.

ORBS was shut down by its Web host, Canadian telco BC Tel, after BC Tel requested that ORBS warn administrators before testing mail servers for third-party spam relay capability.

BC Tel...