List of the Top 25 Email Security Software for Windows in 2025

Cynet provides Managed Service Providers (MSPs) and Managed Security Service Providers (MSSPs) with a comprehensive, fully managed cybersecurity platform that integrates vital security features into a single, easily navigable solution. This consolidation not only streamlines the management of cybersecurity but also minimizes complexity and reduces expenses, thereby eliminating the necessity for engaging multiple vendors and managing various integrations. With its multi-layered approach to breach protection, Cynet ensures strong security across endpoints, networks, and SaaS/Cloud environments, effectively safeguarding against the constantly evolving landscape of cyber threats. The platform's sophisticated automation capabilities significantly improve incident response, allowing for rapid detection, prevention, and resolution of potential security issues. Additionally, Cynet’s dedicated CyOps team, backed by a 24/7 Security Operations Center (SOC), continually monitors client environments and provides expert advice to maintain optimal security. Collaborating with Cynet enables you to offer state-of-the-art, proactive cybersecurity services while enhancing your operational efficiency. Discover how Cynet can transform your security services and empower your clients to navigate the complexities of the digital landscape with confidence and resilience. By choosing Cynet, you position your organization at the forefront of cybersecurity innovation, ensuring that you remain competitive in a rapidly evolving market.

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!

An innovative defense mechanism designed to combat phishing, ransomware, and the ever-changing landscape of email threats. Seamlessly integrating with your current infrastructure, our service strengthens your security measures, whether implemented in the cloud or on-site.

Guardz is an advanced cybersecurity solution driven by AI, designed to equip Managed Service Providers (MSPs) with the tools necessary to safeguard and insure small to medium-sized enterprises against cyber threats. This platform offers automated detection and response mechanisms that shield users, devices, cloud directories, and sensitive data from potential attacks. By streamlining cybersecurity management, it enables businesses to concentrate on their expansion without the burden of complicated security measures. Additionally, the pricing structure of Guardz is both scalable and economical, providing thorough protection for digital assets while promoting swift implementation and supporting business development. Moreover, its user-friendly interface ensures that even those without extensive technical knowledge can effectively manage their cybersecurity needs.

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.

Mailfence is a provider of encrypted email services that employs OpenPGP-based encryption along with digital signatures for enhanced security. It boasts an array of features that facilitate collaboration while ensuring both security and convenience are maintained. Users can securely store and edit documents through Mailfence Document, and sharing these documents with teammates is as simple as a single button press. Additionally, the Mailfence Calendar helps users manage tasks, meetings, events, and other vital information efficiently. The Contacts feature allows for the storage of contact information and the creation of mailing lists, which enhances overall productivity. Designed with full interoperability in mind, Mailfence can be synced seamlessly with various services. Furthermore, it offers fully customizable whitelabel versions of its interface, catering to diverse branding needs. In a commitment to online privacy, Mailfence contributes 15% of its PRO subscription revenue to organizations like IFF or EDRI. This dedication to supporting privacy advocacy is a testament to Mailfence's values.

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.

KDMARC serves as a robust email authentication and anti-spoofing tool that assists organizations in safeguarding their outgoing email communications. With its Dynamic SPF feature, users can effortlessly manage domain and IP whitelists and blacklists directly from the KDMARC dashboard with just one click. Additionally, the Dynamic DMARC capability enables organizations to adjust their policies—None, Quarantine, or Reject—instantly to respond to security needs. This innovative solution is crafted to empower users to implement necessary security measures swiftly, thereby enhancing overall email safety. By preventing brand exploitation, boosting email delivery rates, and mitigating risks associated with malware and ransomware, KDMARC fosters greater trust in email communications and ultimately drives higher engagement levels. As a result, organizations can strengthen their reputations and ensure a secure exchange of information.

Trustifi delivers top-tier email security services designed to assist businesses of all sizes in effectively managing threat detection, ensuring compliance with regulations, and implementing data encryption. Its solutions can be easily integrated with popular email platforms such as Outlook and Gmail, as well as any other email server through a relay system. Among the features offered are Advanced Threat Protection, which includes malware and ransomware detection along with Business Email Compromise (BEC) attack prevention alerts, as well as Data Loss Prevention that adheres to strict compliance standards like HIPAA/HITECH, PII, GDPR, FSA, LGPD, and CCPA. Furthermore, Trustifi provides NSA-grade encryption to safeguard sensitive information, and only select Enterprise clients are granted access to customized branding and product white-labeling options. Additionally, personalized training sessions are available for teams to enhance their understanding of the system. Given the diverse encryption needs of organizations, Trustifi recognizes that there is no universal solution for email security, and thus frequently offers tailored solutions upon request, often at no additional cost. This commitment to customization ensures that each client's unique security requirements are effectively addressed.

Secure email communication is a fundamental right for everyone, and Tutanota emerges as the leading choice, crafted with user-friendliness and privacy as its core principles. By creating a free account, you can take charge of your inbox once more. With state-of-the-art features such as end-to-end encryption and two-factor authentication, the level of email security is unmatched. Its integrated encryption guarantees that your mailbox remains exclusively yours, safeguarding your data from unauthorized access and interpretation. Being open source not only fosters transparency but also allows security experts to review the protective code, thereby bolstering confidence in its safety. Our Android app operates independently of Google services, establishing Tutanota as the top open source email solution. Available on both iOS and Android platforms, your secure communications are perpetually accessible. Our fast web client and extensive applications ensure a smooth process for sending encrypted emails. We are committed to your email privacy by offering an ad-free service, relentlessly striving to enhance encryption so you can focus on what is most important. With a clean and simplistic interface complemented by customizable features, Tutanota is resolutely focused on fulfilling your email needs effectively, ensuring a secure and user-centered experience. This commitment to privacy and usability sets Tutanota apart in the crowded email landscape.

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.

Zivver serves as an advanced digital communications platform designed to facilitate the future of secure online interactions. Its user-friendly, intelligent, and secure features make it a preferred choice for over 5,000 organizations across the globe. By effectively mitigating the risk of data breaches caused by human mistakes, Zivver ensures adherence to regulatory standards. The platform integrates effortlessly with all leading email services, such as Outlook, Gmail, and Microsoft 365. It boasts exceptional zero-keys encryption along with innovative functionalities, including context-driven machine learning to create business rules automatically. With Zivver, users can safely send large files of up to 5TB using their regular email applications. Moreover, Zivver adheres to all essential data security protocols, including ISO 27001, NTA 7516, GDPR, and HIPAA, further cementing its reputation as a trustworthy solution in the realm of secure digital communication. This commitment to security and compliance makes Zivver an invaluable asset for organizations looking to enhance their digital communication strategies.

Discover reliable, enterprise-grade email, calendar, and collaboration solutions that fit your budget. Kerio Connect presents a wide array of features for communication and teamwork, eliminating the complexities and high expenses typically linked to other services. It offers an integrated experience that combines email with shared calendars, scheduling tools, contact management, tasks, notes, shared and public folders, along with instant messaging capabilities. Users can easily sync their emails to their favorite mobile devices via Microsoft ActiveSync. The Instant Messaging functionality supports XMPP, making it compatible with various third-party chat and IM applications across both desktop and mobile platforms. Setting up Kerio Connect is a breeze, taking only 10 minutes, after which users can begin working almost immediately. This solution can be implemented on-site or through cloud environments hosted by partners, catering to users on Mac, Windows, or Linux systems. Additionally, it ensures full support for Outlook on both Windows and Mac, along with compatibility for numerous other IMAP or POP-compliant email clients, providing flexibility and smooth integration for every user. Embrace a collaborative experience that is straightforward and efficient, allowing your team to focus on what truly matters.

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.

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.

DocsCorp is the preferred choice for document management experts seeking software that enhances their efficiency and simplifies their tasks. With a strong global presence, we serve over 500,000 users across 65 nations. Our diverse range of products includes tools for document creation, email recipient verification, metadata cleaning, and document comparison, along with desktop, server, or cloud-based PDF creation and conversion solutions. Our software integrates seamlessly with leading enterprise content management systems, which boosts productivity and streamlines workflows. We provide organizations with both on-premises and cloud integration options to suit their needs. Our focus is on supporting document-centric industries by helping them effectively manage their most vital resource - documents. Our clientele spans various sectors, including Government Departments, Legal Services, Financial Services, and Technology companies, all of which rely heavily on efficient document management. In addition, we continually strive to innovate and improve our offerings to meet the evolving demands of these industries.

CB Exchange Server Sync facilitates the secure transfer and synchronization of data between Exchange Servers, streamlining the process for multiple Outlook accounts hosted on either Exchange Server or Office 365. This tool can be tailored to fit the specific requirements of your business, enabling the synchronization of emails, calendars, tasks, contacts, public folders, and other critical information. Furthermore, it supports the smooth migration of your entire Exchange or Outlook setup to Office 365 or different versions of Exchange starting from Exchange 2010 SP1 onward. When used in conjunction with other solutions, it enhances security and functionality, offering a comprehensive approach to data management. Notably, pairing it with CB Super Secure Exchange Server helps protect against unauthorized access by hackers aiming to infiltrate secure networks through Exchange Server. Additionally, integrating Outlook Content Censor allows users to access their Exchange accounts remotely while safeguarding sensitive information by limiting the visibility of attachments, addresses, and signatures. Thus, CB Exchange Server Sync not only simplifies migration but also fortifies overall data security in your organization.

Xeams is a robust and secure all-in-one email server compatible with various operating systems, including Windows, Linux, Solaris, MacOSX, and other UNIX variants. The server supports essential protocols such as SMTP, POP3, and IMAP, ensuring comprehensive email functionality. One of its standout features is a highly effective spam filtering system that can remove as much as 99 percent of unwanted emails right from the start. Additionally, its user-centric design allows for a customizable email experience, making it accessible for users of all levels. With its impressive capabilities, Xeams stands out as an excellent choice for managing email communications efficiently.

Safeguard your business effortlessly with a one-click solution that delivers comprehensive protection across the board. This integrated approach to threat defense ensures a well-rounded, state-of-the-art safeguard that won’t overburden your IT team. By leveraging advanced AI, our system not only predicts potential risks but also swiftly detects and resolves problems, allowing you to focus on what truly matters—your business's growth and success.

Safeguard your organization against unintentional data leaks with VIPRE SafeSend, an effective and proactive tool tailored for Microsoft Outlook. SafeSend prompts users to verify external recipients and attachments prior to sending emails, which greatly minimizes the chances of sending misaddressed messages and incurring expensive errors. Unlike conventional Data Loss Prevention (DLP) systems that only intervene after emails have been dispatched—placing additional pressure on already stretched security teams to assess and approve them—SafeSend operates in real-time, allowing employees to spot and rectify potential mistakes beforehand. Furthermore, SafeSend meticulously scans outgoing emails and attachments to ensure sensitive information remains securely within your organization's network, delivering an added layer of security. As time progresses, employees will organically cultivate improved email practices, promoting a workforce that is more attuned to security concerns. SafeSend is offered in two distinct packages: one aimed at preventing misaddressed emails and another catering to broader DLP requirements. With VIPRE SafeSend, your organization not only minimizes the risk of data leaks but also cultivates a culture of vigilance and responsibility among its members, ultimately enhancing overall data security.

RMail®, an e-security solution offered by RPost®, emerged as a prominent global leader in the year 2000. Specializing in user-friendly email encryption, RMail provides services that ensure privacy, compliance, legal delivery proof, secure file sharing, email rights management, protection against email impostors, and overall email encryption. The transmission security services provided by RMail are particularly beneficial for professionals and organizations tasked with sending sensitive or consumer-regulated data. These offerings extend beyond the capabilities of standard email and encompass: (a) a simplified and more automated email encryption process for enhanced privacy compliance; (b) a reliable proof record detailing the sender, recipient, and content of each email; (c) confidence regarding the delivery and open status of critical emails that are time-sensitive; (d) a timestamped confirmation of content delivery; and (e) the ability to securely share large files, making RMail an indispensable tool for modern communication needs.

The Accellion secure communication platform effectively mitigates data breaches that stem from external cyber threats. Chief Information Officers and Chief Information Security Officers depend on Accellion to maintain comprehensive oversight, adherence to regulations, and authority over the transfer of intellectual property, personal identifiable information, and protected health information across various third-party communication methods. This encompasses channels such as email, file sharing, mobile applications, enterprise portals, SFTP, and automated inter-business processes, allowing users to confidently select the Accellion button as the most reliable method for sharing sensitive data beyond their organization. Additionally, the Accellion platform provides a range of deployment options, including FedRAMP, hybrid, and on-premise solutions, ensuring that organizations can choose the configuration that best meets their needs. By delivering the necessary security and governance frameworks that CISOs demand, Accellion helps organizations mitigate risks while complying with stringent regulations like NIST 800-171, HIPAA, SOX, GDPR, and GLBA. With a strong track record, more than 25 million users across over 3,000 organizations have benefitted from the protective capabilities of Accellion’s solutions, highlighting the platform's extensive reach and effectiveness in safeguarding sensitive information.

WikiLocks operates similarly to your functionality, integrating seamlessly with your frequently used applications. You begin by choosing the data you want to secure, then designate access permissions for specific individuals and groups. Once this setup is complete, you can share the newly secured document. Remarkably, no matter how the document is accessed, whether it's copied or pasted, its protection remains intact throughout its entire lifecycle, ensuring consistent security measures are upheld. This level of protection provides peace of mind when sharing sensitive information.

Relying on a single antivirus engine for your email security is no longer necessary when you can utilize four powerful options. GFI MailEssentials taps into the capabilities of leading brands such as BitDefender, Kaspersky, and Avira, each offering distinct detection techniques and heuristics. This multi-engine approach enhances your ability to effectively block viruses and malware that may infiltrate your email. With spam constituting nearly 45% of all email traffic, GFI MailEssentials employs 14 sophisticated filtering technologies that demonstrate their effectiveness in real time. By filtering out spam before it reaches inboxes, you can conserve both server space and time. The system excels at stopping spam, blocking forged emails, eliminating messages that link to known malicious URLs, and identifying phishing attempts while also removing nonRFC compliant emails. Furthermore, it can detect emails from fraudulent senders and apply various other strategies to minimize spam. Notably, GFI MailEssentials is compatible with email servers beyond just Exchange, ensuring it can integrate smoothly into your current infrastructure. This versatility makes it an excellent choice for organizations looking to bolster their email security.

M365 Manager Plus serves as an all-inclusive tool for managing Microsoft 365, allowing users to report, oversee, monitor, audit, and set alerts for essential activities. It streamlines the management of services like Exchange Online, OneDrive for Business, and Skype for Business from a single interface. This software provides a vast array of pre-configured reports tailored for Microsoft 365, facilitating intricate tasks such as bulk user and mailbox management, secure delegation, and mail handling. With 24/7 monitoring capabilities, it ensures users are promptly informed via email notifications regarding any service disruptions. Additionally, M365 Manager Plus enhances compliance management through its built-in compliance reports. Furthermore, it boasts advanced features for auditing, alerting, and reporting, which are crucial for maintaining the security of your Microsoft 365 environment, ultimately making it an indispensable resource for administrators.