Proactive, multi-layered email security defenses are of critical importance to businesses’ security and success in 2021 and beyond. Over 90% of modern cyberattacks begin with a phishing email. Threats such as spear phishing, fileless malware and zero-day exploits are rapidly evolving to become increasingly sophisticated, evasive and costly for victims.

Static, single-layered defenses - like those built into Microsoft 365 and Google Workspace - are no longer effective in combating today’s advanced attacks. This article will explore the inner workings of Guardian Digital EnGarde Cloud Email Security - an innovative, full-managed supplementary email security solution capable of safeguarding your users, your data and your brand against the most sophisticated and dangerous attacks.

Why Is Proactive, Multi-Layered Protection Critical in Securing Business Email?

Effective email security is contingent upon defense in depth. No single security feature is sufficient in fortifying email against sophisticated modern exploits. We recognize this and have engineered our landmark solution - EnGarde Cloud Email Security - with an intuitive, multi-layered design. The various layers of security that comprise EnGarde work harmoniously to detect and block threats in real-time, building on each other to provide stronger, more effective protection than any of these features would on its own. Informed by global Threat Intelligence data gathered through Artificial Intelligence (AI), Open-Source Intelligence (OSINT) and Machine Learning (ML), EnGarde is constantly learning from and adapting to the threats that challenge it and updating its protection in real-time to remain ahead of emerging threats and prevent future attacks.  

Let’s take a closer look at the “layers” of EnGarde, and the role that each pays in fortifying the inbox.

Breaking It Down: What Are the Defining Features of EnGarde Cloud Email Security?

Open-Source Community Input

Unlike any other solution on the market, EnGarde draws on extensive resources, tools and intelligence available through the vibrant, global open-source community. A product of open-source development, EnGarde is uniquely supported by a collaborative, innovative global input program - resulting in rapid updates and superior security and resiliency. In this community-powered development model, emails gathered from millions of systems from around the world are used to identify patterns and perform large-scale tests on filters. Results of these tests are then distributed back to Guardian Digital engineers and incorporated into EnGarde.

Expert Managed Services & Accessible Support

Managed Services are a key component of an effective email security solution that is too often overlooked. Ongoing expert system monitoring, maintenance and support can simplify administration, improve security and reduce costs - delivering a rapid return on investment (ROI).

EnGarde is managed around-the-clock by a team of experienced security experts who become a valuable extension of your company’s IT team, partnering with your business in securing its users, critical data and reputation, and acting as the front line of defense against cyber criminals. Our experts work with you to understand your security needs, identifying individuals within your organization who are most likely to be targeted in an attack and closely monitoring them to watch for targeted threats.

Layered Email Authentication Protocols

Email authentication protocols - namely, SPF, DMARC and DKIM - are crucial in preventing sender fraud and protecting sensitive information. These key standards verify sender identity and confirm the legitimacy of email communications.

EnGarde implements SPF, DMARC and DKIM to their fullest to prevent phishing and spoofing attacks and protect sensitive data in transit. EnGarde goes beyond standard measures of email authentication, tracking hundreds of thousands of message attributes including sender-recipient relationships, domain reputation, email headers and envelope attributes and message content.

Malicious URL Protection

Phishing is the predominant modern cybersecurity threat that businesses face. Since the majority of phishing emails leverage malicious links to trick users into sharing sensitive credentials or installing malware on their devices, Malicious URL Protection pays a central role in identifying and blocking these dangerous, costly attacks. 

EnGarde features Guardian Digital URL Protect, which provides state-of-the-art malicious URL protection by extracting links from Microsoft Office documents, PDFs, archive files (ZIP, AIZip, JAR) and other file types (uuencoded, HTML) and conducting a dynamic real-time analysis of these files in order to detect malicious URLs leading to compromise.

Spam & Virus Protection

Spam and viruses are serious, persistent threats to all email users. Spam email is not only annoying, it can also contain dangerous links and attachments, and an email virus can result in inconvenient and costly downtime for your organization. Traditional spam filters and signature-based antivirus software alone are no longer sufficient to protect users, systems and critical data. Spammers are now using advanced, stealthy techniques such as social engineering to evade spam filters and deceive users, and complex polymorphic viruses are capable of modifying themselves to avoid detection. Modern spam and virus protection requires adaptive, layered defenses, such as those seen in EnGarde.

EnGarde features multiple layers of detection engines capable of performing predictive spam and virus detection through heuristics analysis - an advanced technique that scans messages for characteristics and behaviors that are unique to spam email. The SpamAssassin spam filtration framework is also built into EnGarde’s layered architecture. If SpamAssassin’s software indicates that a message resembles spam, EnGarde quarantines the email - preventing it from reaching the end user. SpamAssassin works in concert with EnGarde’s other proactive detection features to reliably block spam email, while keeping the rate of false positives impressively low.


Once a message has been scrutinized by all of EnGarde’s security features and technologies, it is deemed either “malicious” or “safe”. All malicious mail is quarantined - never reaching the intended recipient’s inbox, where it could potentially cause great harm. Only confirmed legitimate, safe mail is delivered to the end user - mitigating the risk that human error and poor user security practices pose to your organization.

Next Steps 

Is your current email security strategy providing you with the caliber of intuitive, layered protection that is necessary to protect your business against today’s advanced threats? Evaluate your current email security posture using our free Email Risk Assessment Tool.

Does your current email strategy have room for improvement? Are you interested in upgrading your email security defenses and protecting your most critical assets with EnGarde? One of our security experts would love to speak with you. Let’s get in touch.>

Must Read Blog Posts

Latest Blog Articles

Recommended Reading