Anti-Spam Technology TetherFilter incorporates internally developed custom algorithms which accurately target and remove illegitimate electronic mail messages. By using technology which examines the protocol and formatting for technical correctness based on internet industry standards, This technique can accurately discriminate between desired electronic mail messages and the undesired smuck. Using this approach, we do not exhibit the dreaded 'false positive' scenario that all other spam filter products produce. Of course, administrators can specify additional content specific rules for removing or monitoring the content of electronic messages which may contain sensitive or inappropriate content or material. Anti-Virus Technology We use a modern digital signature technique to quickly identify electronic messages which contain viruses and quarantine or delete them before they enter your email server.