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Filtro de spam multicamada

Na Rackspace, atualizamos constantemente o sistema de filtragem de spam que usamos para nossas caixas de Rackspace Email em um processo multicamada que elimina 98% do spam, com quase zero de falsos positivos. Você recebe filtragem de spam sem nenhum custo adicional em todas as contas Rackspace Email.

Layer 1: The Gateway Scan

As soon as an email arrives, our gateway servers try to match the sending IP address to an aggregated blacklist compiled from multiple spammer tracking systems. The servers analyze the email message in comparison to other arriving mail. If a large number of emails arrive simultaneously from a single IP, or are addressed to users that do not exist in our system, it could signify a spam attack, and the servers block the offending email. If the sending address is from a domain in our system but the mailbox does not exist, the servers block the email.

Layer 2: Cloudmark® Scan

We scan all email with Cloudmark's industry-leading spam detection software. Cloudmark uses Advanced Message Fingerprinting™ to detect viruses, spam, and phishing. Advanced Message Fingerprinting uses algorithms that detect spam across all languages and character formats. These algorithms update every 60 seconds based on worldwide feedback loops and the latest spam tactics.

Layer 3: The Message Sniffer Scan

We scan email with Message Sniffer from ARM Research Labs. Message Sniffer relies on pattern recognition and machine learning technology to detect spam and malware. It searches the entire message for spam and malware features, including unusual headers, message source behaviors, structural artifacts, obfuscation techniques, binary and image signatures, email and URL targets, unusual code fragments, and even coding styles.

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