List of the Top 25 Email Security Software for Microsoft 365 in 2026

Guardz is the unified cybersecurity platform built for MSPs. We consolidate the essential security controls, including identities, endpoints, email, awareness, and more, into one AI-native framework designed for operational efficiency. With an identity-centric approach, an elite threat hunting team, and 24/7 AI + human-led MDR, Guardz transforms cybersecurity from reactive defense into proactive protection.

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!

Odix, recognized as a frontrunner in the Enterprise CDR (Content Disarm and Reconstruction) sector, has introduced FileWall, a dedicated cybersecurity application specifically designed for Microsoft Office 365 mailboxes. This innovative tool, FileWall™, integrates seamlessly with Microsoft security offerings such as EOP and ATP, providing comprehensive defense against unfamiliar threats posed by email attachments. Furthermore, FileWall™ maintains the integrity of sender-related security features, setting it apart from other Microsoft security solutions that may compromise these capabilities. By ensuring robust protection without sacrificing existing security measures, FileWall™ represents a significant advancement in 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.

Introducing PhishTitan, a cutting-edge inline phishing protection and remediation solution designed for Microsoft 365, leveraging advanced AI technology to combat phishing threats effectively. Developed by TitanHQ, a leader in email cybersecurity, PhishTitan specifically addresses the sophisticated phishing and business email compromise (BEC) attacks that Microsoft may overlook. It equips users with real-time warning banners, enabling them to assess the safety of incoming emails and bolstering their ability to act as a human firewall. One of its standout features is post delivery remediation (PDR), which enables the removal of phishing emails from users' inboxes, thus mitigating risk immediately; these threats are then redirected to the junk folder for added security. The email threat intelligence data provided by PhishTitan is exceptional in its clarity, visibility, extensive coverage, and precision, ensuring that users are always informed about potential risks. With a remarkably simple deployment process taking just six minutes, PhishTitan effectively filters your email to detect and neutralize phishing threats, safeguarding both your users and business. This swift implementation is crucial in preventing that single erroneous click that could lead to a significant security breach, illustrating how PhishTitan can be a game-changer for organizations. By choosing PhishTitan, you’re not just enhancing your email security; you’re empowering your team to navigate the digital landscape with confidence.

Strengthening the protection of your email accounts is vital, as email continues to be the main conduit for various threats. It is important to expand your security strategies to detect dangerous threats proactively and to effectively respond to and manage emerging risks as they occur. Understanding the malicious strategies that can target your organization is crucial for prevention. By identifying the specific vulnerabilities your business faces and categorizing the threats, you can gain a clearer picture of which areas are most at risk of an attack. Employing AI-driven threat detection allows multiple systems to simultaneously scrutinize various elements of incoming emails. The data collected from these analyses ensures accurate threat identification, evaluates potential business risks, and aids in formulating appropriate response plans. Cyber threats can come from numerous sources, such as phishing attacks, business email compromises, malware infections, and ransomware invasions. Safeguard your organization against all these dangers by leveraging advanced threat intelligence, which empowers you to act swiftly against any emerging risks. Given the constant evolution of cyber threats, it is essential to stay one step ahead of potential attackers by adopting robust and comprehensive security solutions that evolve alongside the threat landscape. Additionally, regular training and awareness for employees can significantly bolster your defenses against these risks.

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 against ransomware, spam, phishing, and a range of other cyber threats that pose risks to small and medium-sized businesses, large enterprises, healthcare institutions, and government bodies, including their contractors. MailRoute provides API-level integration with platforms such as Microsoft Office 365 & GCC High, Google Workspace, and other email service providers, effectively reducing the likelihood of email-related attacks that could jeopardize sensitive information and systems. Our service delivers an affordable, multi-layered defense strategy that aligns with CMMC, NIST 800-171, HIPAA, and DFARS compliance, and is recognized by DISA for its email security capabilities. Built to eliminate any single point of failure, our fully owned infrastructure includes geo-distributed data centers that are outfitted with redundant network connections, power sources, and cooling systems, achieving a remarkable uptime of 99.999%. In addition, MailRoute combats email forgery and spoofing through sophisticated email authentication methods and managed DNS adjustments. By continuously overseeing and updating your email network security, we mitigate cyber threats and lessen risks like operational downtime, fostering both predictable costs and dependable services. Our ongoing commitment to reinforce email security reflects our determination to protect your digital assets from the constantly changing landscape of cyber threats, ultimately ensuring peace of mind for your organization. As the digital world evolves, so does our approach, adapting to new challenges to offer the best protection possible.

Uncover the definitive answer for recognizing, monitoring, and safeguarding sensitive data on a grand scale. This all-encompassing data protection platform is meticulously crafted to quickly address risks, detect anomalies in activity, and maintain compliance, all while ensuring your operations run smoothly. By merging a powerful platform with a committed team and a strategic framework, it provides you with a significant advantage in the marketplace. The platform incorporates classification, access governance, and behavioral analytics to effectively protect your information, counteract threats, and streamline compliance requirements. Our proven approach is informed by numerous successful implementations that assist you in overseeing, securing, and managing your data with ease. A dedicated group of security experts constantly refines advanced threat models, updates policies, and aids in incident response, allowing you to focus on your primary goals while they navigate the intricacies of data security. This joint effort not only strengthens your overall security stance but also nurtures an environment of proactive risk management, ultimately leading to enhanced organizational resilience. Additionally, as the landscape of data threats evolves, our platform adapts to ensure continuous protection and peace of mind.

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.

Effortlessly oversee email signatures for every user across all their devices. Designed specifically for Microsoft 365 and Google Workspace, this platform boasts decades of expertise in managing email signatures effectively. Ensure that all employees have consistent, professionally branded, and current signatures, regardless of their device, department, or location. You can also design targeted email signature marketing banners that appear beneath contact information to communicate updates, highlight achievements, showcase values, promote content, and much more, all featuring clickable calls-to-action to enhance engagement and drive traffic. With a role-based login system, the marketing or communications department can manage everything seamlessly. Once the initial setup is completed in just 45 minutes, IT teams are free from any ongoing responsibilities. The platform is securely hosted in ISO 27001-certified data centers, specifically on Microsoft Azure, guaranteeing optimal security for data storage in compliance with all laws and regulations, including GDPR. This robust framework not only safeguards sensitive information but also enhances user confidence in the management of their email communications.

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.

Make a wise investment today to bolster your defenses against email security threats by acquiring a robust email security solution tailored for small businesses at affordable rates. Cybercriminals are increasingly targeting high-level executives like CEOs and CFOs across various sectors, alongside crucial departments such as HR and Accounting. While Office 365 offers some level of protection, its capabilities are insufficient to effectively combat impersonations, email fraud, and phishing attacks. Relying solely on custom transport rules to block domains and guard against employee impersonations can leave significant gaps in security. PhishProtection stands out as it is compatible with all email servers, devices, and SMTP services, ensuring comprehensive protection regardless of your location or the email client you use. Whether you access your emails through your phone, Outlook, or other platforms, this solution offers top-notch security for both Android and iOS devices, making it a critical investment for safeguarding your business communications. In today’s evolving cyber landscape, prioritizing email security is not just smart; it's essential for every small business.

An additional layer of security has been established to block potential threats from infiltrating users within the network. This system is meticulously crafted to protect email communications, which are frequently the most vulnerable to cyberattacks. ESET proudly offers a true 64-bit product that accommodates clustering, ensuring that organizational speed remains efficient regardless of size. ESET Mail Security solutions incorporate a unique blend of anti-spam, anti-phishing, and host server protection, utilizing machine learning, comprehensive data analysis, and expert insights within an award-winning mail security framework. This advanced functionality significantly diminishes both unsolicited emails and targeted threats, allowing employees to focus on their tasks while maintaining uninterrupted business operations. Users are often confronted with phishing attempts that can carry additional malicious components, highlighting the necessity for a cohesive email security strategy. Depending on individual users to identify genuine emails can be an inefficient method, as they may quickly become overwhelmed by this responsibility. To ease this challenge, users are automatically alerted about spam emails that are quarantined, thereby improving their capability to manage their inboxes with greater efficiency. Furthermore, these notifications ensure that legitimate communications are not overlooked amidst the clutter of spam.

Managing Office 365 has never been simpler. With AD Users & Computers, you can oversee everything without the hassle of Exchange on-premises. Easy365Manager seamlessly merges Office 365 and Active Directory management, allowing you to avoid logging into web consoles or executing PowerShell commands. This tool introduces two additional tabs for user properties within AD Users & Computers, enabling management of Exchange Online mailboxes directly from AD user properties. This includes handling intricate configurations such as calendar delegation, which typically necessitates PowerShell knowledge. By utilizing Easy365Manager, first-level administrators can increase their efficiency, significantly decreasing the volume of issues that need to be escalated to senior staff. Moreover, installation is straightforward; it can be set up on any PC or server equipped with AD Users & Computers without requiring any server component, service, AD Extension, or custom security protocols. In less than two minutes, Easy365Manager can be installed and configured, providing immediate relief from the complexities of hybrid Office 365 management. Additionally, this tool enhances productivity while simplifying the administration of user accounts across platforms.

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.

Raptor Email Security is an MX-based system crafted by specialists to effectively block spam, phishing attempts, and malware threats, employing an innovative scoring system along with various technologies like ClamAV, MIMEDefang, and Sendmail. Our dedicated team of spam experts guarantees a spam-free experience, resulting in zero spam and zero support tickets while doubling your resources. By routing your emails through our servers, your system gains robust protection against most cyber threats, allowing you to expand your hosting revenue by adding additional accounts and optimizing resource use. Enhanced by Raptor Review, our service offers a thorough evaluation of your email setup, featuring a premium support line to address issues such as spam blocking, delivery enhancement, scam detection, and recovery of lost emails. Setting up Raptor Email Security is quick and easy, taking just a few minutes, and you can enjoy a complimentary 30-day trial to experience its benefits firsthand. With this solution, you can ensure that your email communication remains secure and efficient while gaining peace of mind.

Mailock secure email offers companies a reliable method for sharing sensitive information with clients while protecting their data from potential breaches. It employs advanced encryption technology combined with multi-factor identity verification, ensuring that confidential emails are effectively safeguarded against cyber threats, thereby keeping customer data secure. Users can effortlessly create secure emails from their desktop or browser, utilizing specific rules and keywords that activate encryption protocols. Furthermore, they have the ability to set up authentication barriers that verify the identities of recipients, guaranteeing that only those who are authorized can access the sensitive information. Each message is accompanied by comprehensive audit trails, allowing users to track recipient engagement through instant read receipts. Recipients are also given the option to encrypt their replies at no additional charge. This service not only promotes secure communication but also empowers clients to interact with your business in a safe manner. Additionally, it streamlines the delivery of confidential documents to clients in bulk through automated secure email processes, enhancing operational efficiency. Ultimately, Mailock fortifies the integrity and confidentiality of business communications, cultivating trust and security in all client interactions while ensuring compliance with data protection regulations.