Email Filtering Solution


Block spam and viruses before they hit your network 21CTI’s Email Spam Filtering Security Solution helps keep your email free from spam, viruses, phishing, and other email threats. 21CTI’s Solution is a hosted solution that blocks spam and other threats well before they reach your enterprise. Unlike legacy products, it requires no hardware or software to install and maintain, thus greatly reducing your IT resource requirements and costs.


  • Complete Email Spam and Virus Protection
  • Real-time processing with scale and reliability
  • Email Security

Complete Email Spam and Virus Protection:

  • Comprehensive message security to stop spam, viruses, phishing, denial of service (DoS), directory harvest attacks (DHA), and other email attacks.
  • Zero-hour anti-virus protection with multi-layered protection, including heuristic and signature-based detection.
  • Extensive and detailed quarantine summary reporting to end users through a convenient web console Content-based policies for inbound and outbound traffic.
  • Built-in lexical analysis for social security and credit card numbers.
  • Build virtually any custom content rule with regular expression matching.
  • Apply a variety of policy dispositions to triggered content — approve, bounce, quarantine, quarantine redirect, log and deliver.

Real-time processing with scale and reliability

  • Patented real-time, pass-through architecture ensures that there are no delays, message loss or disruptions to email service, regardless of how high spam volumes climb.
  • 99.999% availability for message processing and capacity to handle billions of transactions a day.
  • Policy enforced domain to domain messaging encryption using standard SSL or TLS protocols.
  • SAS 70 Type II certified and Web Trust seal validates 21 CTI’s Email SPAM Filtering Solution’s stringent standards for physical and operational security, assuring the safety of your communications.
  • Manage communication policies for message attachments and content.
  • Secure your inbound and outbound email from spam, viruses, phishing, and other email-borne threats.
  • Set central email policies to manage content and compliance requirements.
  • Receive email messages even if your email server goes down.

Complete Email Spam and Virus Protection:

  • Includes Transport Layer Security (TLS) support, allowing encryption of sensitive email communications (can be automatically enforced for communications between designated email domains).
  • Includes patented anti-spam technology, which examines thousands of elements of an email message to determine safety.
  • Delivers exceptionally low false positive rate.

Table 1: Summary of Email Filtering Features
Features Benefits
Spam and virus protection Provide multi-layer threat identification including heuristic and signature-based detection, commercial anti-virus engines, and “zero-hour” protection from rapidly mutating viruses
Directory harvest attack/denial of service blocking Prevents attacks with patented behavior analysis
Patented pass-through architecture Ensures maximum privacy of your email
Content policy management Enforces acceptable use policies and content compliance for inbound and outbound email
Scalability Built-in scale for dealing with any kinds of spam spikes or targeted attacks
Web-based administration console Allows real-time user and policy updates, configuration changes, and reporting
Log search Retrieve and export log information on inbound and outbound message routing details
Email spooling Continue to receive email messages even if your email server goes down

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