| 摘要 |
Proximity detection algorithms are used to determine whether or not the sender of the message is authentic, by verifying if the sending host is within proximity of registered MX Hosts, WWW Hosts, and/or DNS servers for the alleged sending domain. Proximity detection, combined with Selective Reverse DNS lookups, provides an extremely effective and accurate e-mail source verification system. As this combination relies solely on the existing Internet Domain Name System for its identifying matrix, an effective anti-SPAM system/method is realized without making any changes to any installed e-mail systems. In addition to proximity detection, Automatic Open Relay Testing Administration (AORTA) is used to perform Open Relay testing on all servers attempting to send a message. Additionally, AORTA manages a list of servers already tested and the response given at the time. Each entry in the list will have a TTL associated with it, which will inform AORTA which servers need to be tested and/or retested.
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