Advanced persistent threats are more complex to detect and prevent than ever before. Powered by Guardian Digital, the EnGarde Email Security Gateway is an auto-learn system that scrutinizes millions of individual characteristics from each email, quickly utilizing resources of systems around the world to identify persistent threats in real time.

shield protecting business email accounts from sophisticated zero-day attacks

Guardian Digital EnGarde Business Email Security Gateway provides a fully integrated business email security cloud-based solution that delivers total end-to-end control of your email, mitigating persistent threat risks and reducing the complexity of your infrastructure.

EnGarde Business Email Security Gateway provides real-time protection with real-time results while continuously adapting to a changing business and security environment. Built on a modern open-source architecture designed by Guardian Digital to be secure and flexible, the EnGarde Business Email Security Gateway provides the benefits of SaaS with our added expertise. This approach delivers increased security and world-class enterprise support.


  • Inbound & outbound business email security protection against all persistent threats  
  • Advanced encryption protection throughout keeps communications secure   
  • Cloud-based solution eliminates up-front costs & expedites deployment   
  • Resilient open source architecture provides increased features and better security
  • Protects users against all forms of emerging and zero-day threats   
  • Enterprise-class availability and scalability   
  • Increase employee productivity & lower IT costs   
  • Unparalleled business email security gateway services & support
lock securing business email accounts from advanced persistent threats

Next Generation Advanced Persistent Threat Defense

Guardian Digital EnGarde Business Email Security Gateway brings together the most technologically advanced open-source developments, a multitude of standards-based security solutions, and the ingenuity and security expertise of Guardian Digital. Protecting against spam, viruses, blended email threats, and corporate policy violations, Guardian Digital EnGarde Business Email Security Gateway is the most vigilant approach to business email security.


  • Effective defense from spam, phishing, and other advanced APT threats   
  • Zero-hour outbreak control protects against new, unknown threats
  • Advanced graphs & reports provides increased visibility & accountability   
  • Scalable cloud-based system simplifies deployment and increases availability   
  • Policy-based encryption seamlessly protects confidential communications   
  • Resilient open source design reduces APT threat risk, provides more features
lock inside shield trustworthy business email security gateway

EnGarde Business Email Security Gateway Features

The Guardian Digital EnGarde Business Email Security Gateway uses sophisticated, multi-layered detection engines and machine learning to provide advanced persistent threat solutions.  Our efforts protect email data and ensure better security and system performance to stop threats before they reach your network.


  • Multi-layered persistent threat protection   
  • Adaptive-learning heuristic system, which continues to improve over time   
  • Dynamic reputation system classifies email based on origin   
  • Next-generation statistical analysis   
  • Robust auditing and reporting   
  • Simplified, consistent administration   
  • A scalable solution, adjustable from the smallest to the largest organizations   
  • Flexible policy management   
  • Secure endpoint encryption using strong cryptography  
  • IP reputation services   
  • Real-time URL filter   
  • Multiple leading anti-virus engines 
business email security gateway protecting Office 365 users from phishing

Prevent Office 365 Account Takeovers, Phishing and Ransomware Attacks

Microsoft Office 365 users have increasingly become a favorite target for threat actors.  Targeted email attacks including phishing and spear phishing threats, account takeover and other advanced persistent threats present significant challenges for businesses moving to the cloud.

Today's threats have become increasingly intelligent. While Office 365 includes some built-in security protections, they may be inadequate to protect your users from the latest forms of targeted attacks. Guardian Digital identifies and blocks zero-day credential theft threats immediately, safeguarding against account takeover and providing a highly effective real-time defense against phishing scams and other targeted threats.


  • Enhances the security of Microsoft Office 365
  • Increase staff productivity through reduced risk using our highly secure cloud platform
  • Multiple layers of additional protection against today's most advanced persistent threats including spear-phishing, account takeover and malicious URLs
  • Inherently secure cloud platform which includes multiple detection engines specifically designed to recognize and block ransomware, spear-phishing and other attacks launched using deceptive social engineering tactics

Learn More about Microsoft Office 365 protection

A visual of some of our business email security gateway services

Protection Against Advanced Persistent Threats

  • Multi-layer anti-virus and heuristic scanning
  • Spam and malware filtering
  • Complex spear phishing attack prevention
  • Real-time URL filtering
  • Detects and stops malicious document attachments inside other types of commonly emailed files
  • Guards web & IP reputation
  • Prevents business Email Compromise (CEO impersonation fraud)
Shields protecting business email from phishing and malware

EnGarde Email Security Gateway: Threat-Ready Business Email Protection. Non-Stop Support.

With its two decades of cyber security expertise, Guardian Digital - and its EnGarde Email Security Gateway - is meeting the challenges of today's sophisticated and relentless email threat landscape. EnGarde is "end-to-end" security. A cloud-based, multi-tiered system that anticipates threats and safeguards your business email.

Let Guardian Digital help you accomplish your strategic business goals by safeguarding your most valuable assets — your employees — and your business information.