List of the Top 23 Email Security Software for Microsoft 365 in 2026

NeoCertified protects confidential data through our secure email application, which operates seamlessly on our adaptable Cloud-based platform. It is accessible via any web browser and integrates with Microsoft Office 365/Outlook and Gmail, while also offering dedicated mobile applications for both iPhone and Android devices. Since our inception in 2002, we have been delivering secure mail solutions that comply with federal standards, enabling organizations to send and receive secure emails from any web browser or mobile platform. Our service is compatible with all email providers, ensuring that businesses enjoy the flexibility and robust security they require for their communications. Additionally, our commitment to constant innovation guarantees that we meet the evolving needs of our clients in an increasingly digital world.

SpamTitan's email security solution safeguards businesses, educational institutions, small to medium-sized enterprises (SMBs), and managed service providers (MSPs) from various email threats including spam. It effectively defends against phishing attempts, zero-day vulnerabilities, viruses, malware, ransomware, and other malicious email activities, ensuring a secure mail flow and filtering out unwanted messages. Our user-friendly yet robust email protection is compatible with Office365, making it accessible for a wide range of users. You can try SpamTitan Email Security risk-free with a fully supported trial. SpamTitan – Comprehensive features included: * Protection against CEO impersonation * Safeguarding against spear phishing attacks * Analysis of links within emails * Complete email sanitization * Defense against zero-day attacks * Mail spooling capabilities * Anti-spoofing measures * Protection against ransomware and malware * Checking for SPF, DKIM, and DMARC compliance * Encryption options available * Fully multi-tenant architecture * Customizable user interface for branding * Complete REST API access * Detailed setup documentation and support Recognized as a top solution in the G2 Crowd Email Security category, SpamTitan Email Security stands out for its premium functionalities and reliability. Begin your free trial today and enhance your email security!

N-able Mail Assure is a cloud-based solution for email security that delivers sophisticated protection against threats for both incoming and outgoing emails, utilizing collective threat intelligence, a comprehensive email archive, and round-the-clock email continuity services. The platform features multi-tenant web interfaces equipped with preset configurations, detailed reporting, and visual tools that enhance oversight and management of all email transactions. This innovative system employs proprietary technology that analyzes extensive email data to enhance its Intelligent Protection and Filtering engine. By incorporating real-time threat pattern detection and leveraging a diverse array of filtering technologies, N-able Mail Assure effectively safeguards users from spam, viruses, phishing attempts, impersonation, malware, and various other email-related dangers. Additionally, its seamless integration and user-friendly interface ensure that organizations can maintain robust email security with minimal effort.

PreVeil transforms the landscape of end-to-end encryption by providing exceptional security for organizations' emails and files, shielding them from various threats such as phishing, spoofing, and business email compromise. The platform prioritizes user-friendliness, making it accessible for employees while remaining simple for administrators to manage. By implementing PreVeil, companies can utilize a secure and easy-to-navigate encrypted email and cloud storage solution that protects vital communications and documents effectively. With its advanced end-to-end encryption, PreVeil guarantees that data is safeguarded at every stage of its lifecycle. Moreover, the platform includes a feature known as the “Trusted Community,” which promotes secure interactions among employees, contractors, vendors, and other external entities. This groundbreaking addition enables users to exchange sensitive materials with confidence, assured that they are shielded from prevalent cyber threats. Ultimately, PreVeil not only enhances security for organizations but also cultivates a cooperative atmosphere that encourages teamwork and collaboration among its users. By prioritizing both safety and usability, PreVeil addresses the evolving needs of modern businesses.

Hornetsecurity 365 Total Protection is tailored to safeguard the Microsoft 365 business ecosystem, delivering extensive security for all 365 cloud services, which encompasses Microsoft Office 365 and Microsoft Outlook 365 email. The company presents two distinct packages to cater to your organization's requirements: the 365 Total Protection Business, which serves as a thorough security solution for Microsoft 365 users, and the 365 Total Protection Enterprise, which incorporates advanced protective features and additional enhancements. You will find that onboarding and utilizing this solution is a straightforward process, allowing for a more efficient approach to IT security management. This ensures that your Microsoft 365 environment remains secure and resilient against potential threats at all times. With such comprehensive offerings, businesses can focus on their core operations with peace of mind regarding their cybersecurity.

MDaemon Technologies has created the email threat detection technology utilized by Security Gateway. For over two decades, this trailblazer in the email industry has been safeguarding email servers from various dangers like viruses, spam, and phishing. Organizations rely on their expertise to maintain the security of their email exchanges. Their protection extends to all email platforms, such as Microsoft Exchange and Office 365, among others. With a dedicated team of email security experts, Security Gateway simplifies the management of your organization’s email security needs. Utilizing the latest advancements in email threat detection technology and policy enforcement tools, Security Gateway ensures that legitimate emails are efficiently delivered to and from your users. Additionally, the cloud service offered by Security Gateway is straightforward to implement, allowing you to concentrate on other vital responsibilities. To learn more about the functionalities of Security Gateway, be sure to check out this informative video.

The extensive capabilities of Advanced Threat Protection effectively prevent the execution of complex cyber-attacks. By utilizing features such as freezing, URL scanning, rewriting, the Sandbox Engine, and Malicious Document Encryption, organizations can safeguard their IT systems from various potential dangers. These protective measures are essential in defending against serious threats like Ransomware, Targeted Attacks, and Business Email Compromise. Additionally, the proactive approach ensures that any emerging vulnerabilities are promptly addressed, enhancing overall security resilience.

Protect the integrity of Microsoft Office 365, Google G Suite, and in-house email systems by deploying the industry's most effective email security solutions. Safeguard users from various threats, including spear phishing, credential compromise, and ransomware, by implementing Email Threat Isolation techniques. Address common email vulnerabilities such as spear phishing, ransomware, business email compromise, and spam with strong protective measures. Thwart spear phishing attempts through a layered defense system that includes threat isolation, spam filtering, advanced analytics, and user training initiatives. Shield against the latest ransomware threats by utilizing sophisticated content defense methods, sandboxing, and link protection technologies designed to detect new and hidden threats, including zero-day exploits. Counteract business email compromise by using impersonation safeguards, enforcing sender authentication, and applying brand protection tactics. Improve your brand's reputation and reduce risks by automating the enforcement of sender authentication methods like DMARC, DKIM, and SPF with Symantec Email Fraud Protection, which effectively tackles the challenges associated with email security. By adopting these comprehensive strategies, organizations not only protect their communications but also cultivate a security-conscious culture among their users, ultimately enhancing overall organizational resilience against email-based threats. Investing in these solutions is crucial for maintaining secure and trustworthy communication channels.

Efficiently categorize deceptive emails while proactively detecting and isolating questionable URLs. Utilizing big data analytics enables precise classification of mass email communications. This comprehensive solution integrates seamlessly with both Google Workspace and Microsoft 365. Spambrella's Email Security and User Awareness Training technology is trusted by numerous leading security-focused organizations worldwide, spanning various industries and regions. By partnering with Spambrella, you can consolidate your email security strategies and user training initiatives on an international scale. Acting as your dedicated email security team, Spambrella ensures a smooth transition while possessing the technical know-how of other major providers like Symantec.cloud, Mimecast, and MxLogic. To safeguard your email users from potential threats, reach out today to arrange a demonstration with our cybersecurity specialists and enhance your email protection strategy.

Guardian Digital offers robust protection against various email threats, including phishing scams, zero-day vulnerabilities, and debilitating ransomware assaults. These dangers represent just a fraction of the numerous risks that email users encounter daily. Given that over 90% of cyber attacks begin with an email, securing email is fundamentally a matter of business security. An effective, purpose-driven solution is essential for safeguarding email communications. It effectively addresses significant security vulnerabilities found in platforms like Microsoft 365 and Google Workspace. In addition, it offers remote assistance, expert installation, and continuous management from a distance. Furthermore, we deliver real-time insights into cybersecurity for businesses, enabling you to evaluate your existing risk profile and bolster your defenses against the pervasive threats that all organizations face through email interactions. Ultimately, our comprehensive approach ensures that your email security is not only reactive but also proactive in minimizing potential threats.

Established in 2012 by a key contributor to the DMARC specification, dmarcian is committed to enhancing global email security by making DMARC readily available through exceptional tools, educational materials, and expert assistance. Employed by thousands and endorsed by support teams worldwide, our DMARC Management Platform provides critical insights and oversight regarding the usage of your email domains. This platform equips organizations of all sizes with actionable information and alerts that facilitate the implementation of DMARC and its complementary technologies, SPF and DKIM, as well as the capability to visualize email delivery metrics and maintain a secure domain infrastructure. Addressing email security weaknesses, bolstering domain and brand reputation, and fulfilling the increasing requirements for DMARC compliance are all achievable with our top-tier services. By harnessing our offerings, businesses can navigate the complexities of email security with confidence and reliability.

LuxSci is dedicated to ensuring the safety of personal information while effectively safeguarding global communications. The company focuses on delivering web and email communication services that adhere to HIPAA regulations. LuxSci develops highly secure and tailored enterprise-level environments and solutions, empowering businesses to meet their unique operational and security requirements effectively. Among the offerings are services like Secure Email, Web, and Forms, which are designed to enhance data protection and facilitate compliance. In addition, LuxSci continuously evolves its services to adapt to the changing landscape of digital security.

Cloud-based applications such as email services, collaboration platforms, and storage options necessitate proactive security strategies. A comprehensive set of safeguards, including spam filtering, anti-malware measures, anti-phishing tactics, and advanced threat protection, serves as an essential barrier against cyber threats. By enhancing your Microsoft 365 services—like Exchange Online, OneDrive, Teams, and SharePoint Online—with an extra layer of advanced security, you can effectively block unwanted emails, prevent targeted attacks, and reduce the risk of ransomware, which allows staff to focus on their primary duties and promotes smooth business workflows. Furthermore, users will receive real-time updates via a dedicated console or alert system, ensuring they remain well-informed at all times. New users also benefit from automatic security measures, offering a complete defense against malware, spam, and phishing threats, complemented by state-of-the-art zero-day defense features and an intuitive cloud management interface. This advanced, award-winning filtering engine enhances performance and efficiently eliminates spam, keeping inboxes clear of unsolicited messages while protecting confidential data. Overall, this approach guarantees that the organization can navigate a digitally evolving landscape filled with various threats securely and effectively. Additionally, continuous updates and improvements to the security systems will further bolster defenses against emerging cyber risks.

Echoworx stands out as a fully-managed SaaS email encryption solution by providing eight distinct methods for sending secure emails, accommodating nine different authentication methods, and offering support in up to 28 languages, which allows for safe communication across various devices and locations. Among its key attributes are multiple secure mail delivery options, including Web Portal, S/MIME, PGP, Secure PDF, Certificate Encryption, Secure Attachments (such as PDF, Office, and ZIP), as well as TLS with fallback. Additionally, it features a wide array of authentication methods like Full OAuth Access, Self-Registration, SMS, Shared Secret Passphrase, SSO, System-Generated Verification Codes, Passwordless options, and Multi-Factor Authentication (MFA) for enhanced security. Users can also benefit from a complimentary full proof of concept trial (POC) and 24/7 access to expert support, ensuring that assistance is always available when needed. The platform allows for seamless end-to-end deployment and includes options for recalling and tracking secure emails. With extensive branding capabilities and self-service account management, Echoworx is committed to providing a comprehensive and user-friendly email encryption experience. Ultimately, this combination of features empowers organizations to enhance their communication security effortlessly.

Libraesva Email Security serves as a robust defense for your organization against both longstanding and new email threats, guaranteeing that only authentic communications are delivered. It provides superior email protection by integrating cloud email solutions with a secure email gateway, further augmented by Libraesva's unique Adaptive Trust Engine. This innovative engine leverages artificial intelligence to analyze typical behavioral trends within organizations and their members, continually assessing the reliability of business communications and proactively identifying any suspicious activities. In addition, Libraesva Email Security thoroughly inspects all incoming and outgoing messages, effectively detecting and neutralizing advanced malware, phishing schemes, business email compromises, spam, and a variety of other potential hazards. Its exclusive sandboxing technology neutralizes dangerous payloads and active content found in attachments, while its proactive URL analysis examines every link, ensuring users are protected from visiting malicious websites. This comprehensive approach not only safeguards your organization’s communications but also enhances overall cybersecurity resilience.

BooleBox is a comprehensive content security solution focused on preserving the integrity and confidentiality of client data against unauthorized intrusions, employing advanced encryption techniques to protect sensitive information from potential breaches. Users can seamlessly create, edit, share, and organize files and folders with a suite of customizable security features that do not compromise user-friendliness. BooleBox ensures data protection across diverse environments, including workplaces, cloud storage, email communications, collaborative projects, and widely used platforms such as Windows, Outlook, Gmail, OneDrive, and SharePoint. Acknowledging the digital threats present today, we offer unmatched safeguarding measures, acting as a reliable protector for your data wherever it goes. Our dedication to securing substantial amounts of data spans various sectors, and since 2011, we have consistently evolved to address new security challenges. Ultimately, our goal is to instill confidence in users, assuring them that their information remains secure regardless of its location. This commitment to security not only enhances user experience but also fosters trust in our innovative solutions.

RevBits Email Security is an advanced solution designed to fill significant voids in the email security landscape. Utilizing innovative algorithms, including a cutting-edge page impersonation detection technique, it ensures an unparalleled level of email scrutiny. Each email is assigned a composite probabilistic score, providing valuable insights and fostering ongoing user education. Furthermore, this robust security tool enhances the overall email security framework by identifying and thwarting sophisticated malicious emails that may bypass existing protections. Ultimately, RevBits Email Security safeguards employee endpoints, which represent the final line of defense in email interactions. This proactive approach not only defends against threats but also empowers users with essential knowledge for better security practices.

At EmailAuth.io, which is affiliated with Infosec Ventures, our primary focus is safeguarding your most precious digital asset: your email. We are committed to enhancing your email deliverability, ensuring you receive the highest return on investment from your email campaigns, and fostering trust with your customers, partners, and vendors alike. Our approach goes beyond mere support; we take charge of the entire process! EmailAuth employs a strategy that encompasses the full journey toward achieving the highest level of security for your domains. Our team of security specialists, along with dedicated customer success managers, collaborates seamlessly with you to ensure your needs are met effectively. Together, we work towards a secure and trustworthy email experience for all your communications.

Smartlockr is a data security platform that prioritizes the needs of people to facilitate secure email and file sharing across entire organizations. By focusing on human factors, Smartlockr provides an intuitive interface designed to help users minimize the risk of data breaches, acknowledging that human error is the leading cause of such incidents globally. The platform is compatible with all operating systems and devices, and it conveniently integrates with existing systems, including a plug-in for Microsoft 365 (Outlook) and an SMTP relay service. Additionally, Smartlockr allows users to securely send and receive large files, accommodating sizes of up to 5 TB. Moreover, it adheres to strict privacy regulations and security standards, such as GDPR, ISO, and NTA 7516, ensuring comprehensive compliance for organizations. This commitment to security and user-friendliness makes Smartlockr an essential tool for modern organizations aiming to protect their valuable data effectively.

Advanced Email Security Solutions. Our platform integrates a robust layer of human security that employs sophisticated encryption, analytics technologies, and contextual machine learning to thwart data breaches initiated by users, safeguard sensitive information (Egress Guard), and pinpoint vulnerabilities within your email infrastructure. In order to empower employees to make informed security choices, we leverage cutting-edge DLP technology alongside contextual machine learning capabilities. This approach effectively identifies and mitigates both accidental and deliberate data leaks, while ensuring that sensitive information is only shared with the appropriate recipients. Our user-friendly plug-in simplifies the process of email encryption, making it accessible for all users. Furthermore, we automate protection measures in alignment with your established security policies. Our intelligent system evaluates the actual threat level of potential breaches by managing data sharing, ensuring that optimal security and control are consistently maintained. Additionally, our eDiscovery software streamlines analytics and reporting processes across your email network, saving valuable time and resources. With our comprehensive solutions, organizations can enhance their email security while fostering a culture of awareness among employees.

Abnormal AI is a cutting-edge cybersecurity platform that uses behavioral AI to shield organizations from increasingly sophisticated email-based threats, including phishing, social engineering, and account takeovers. By analyzing human behavioral patterns and identifying anomalies, Abnormal AI detects AI-generated attacks that move at machine speed and frequently evade standard security measures. The platform’s fully autonomous AI-driven agents quickly neutralize threats without human intervention, allowing security teams to focus on higher-priority tasks. Seamlessly integrating with popular cloud email platforms such as Microsoft 365, Abnormal AI provides a multi-layered defense that reduces operational overhead while enhancing protection. Trusted by over 3,000 customers worldwide, including a significant portion of Fortune 500 companies, the platform delivers a 90% reduction in phishing attacks and cuts security operations center (SOC) staffing needs by half. Users appreciate the platform’s rapid deployment, often identifying threats within days, and its continuous improvements based on customer feedback. The solution also automates routine SOC workflows, improving efficiency and response times. Abnormal AI’s unique, human-focused behavioral approach addresses the root cause of email threats by protecting humans rather than just blocking attacks. Industry leaders from diverse sectors report substantial decreases in impersonation attempts and increased confidence in their email security posture. By proactively combating AI-powered threats, Abnormal AI helps organizations safeguard their finances, reputation, and operational continuity in an evolving threat landscape.

Email continues to serve as the main gateway for various cybersecurity threats. Conventional antivirus solutions that rely solely on signatures and basic anti-spam measures with a focus on reputation are inadequate in countering the more advanced techniques and social engineering strategies being utilized today. It is crucial to protect yourself from a range of threats such as ransomware, malware, phishing schemes, and business email compromise. With the increasing stringency of regulatory requirements, adopting best practices for email security has become vital to safeguard internal systems, customer data, and maintain email archives. Furthermore, improving the security features of your cloud email and collaboration tools is essential to enhance their overall functionality. Many organizations prioritize investments in email and productivity tools to increase workplace efficiency, often overlooking the critical aspect of security. SilverSky offers a holistic suite of cloud email, productivity, and collaboration solutions that are equipped with integrated security features, ensuring robust protection against potential threats. By emphasizing security within your digital collaboration frameworks, you can foster a more secure working environment, ultimately benefiting both employees and clients alike. Investing in comprehensive cybersecurity measures not only fortifies your defenses but also instills confidence in your stakeholders.

Our platform has been carefully crafted to address the complex threats that pervade the current digital environment. Whether your company has 5 employees or 10,000, ContentCatcher is the ideal solution. Given that email is the predominant channel for business communication, any disruption to your email server or service provider can have serious financial implications. ContentCatcher features a 24/7 emergency inbox that automatically activates during such outages, ensuring uninterrupted operations for your business. Users can conveniently access this emergency inbox via our online portal, which includes a fully operational email client for sending and receiving messages, thus facilitating a smooth workflow with minimal disruption. Both small businesses and large corporations are equally susceptible to email-related threats, as cybercriminals often target organizations indiscriminately, regardless of size or industry. Therefore, implementing a strong email security solution is essential for protecting your organization effectively. With a range of packages to choose from, ContentCatcher is designed to adapt to your current needs while preparing for future challenges, thus ensuring continuous protection. Our dedication to evolving alongside your business keeps you ahead of potential threats, making it crucial to invest in proactive security measures. Furthermore, staying informed about the latest security trends will enhance your organization’s resilience against cyberattacks.