Best Cloud Email Security Software for 2026

Symantec Email Security.cloud stops targeted spear phishing and other email threats with the industry’s most effective and accurate email security solution.

Mimecast's Secure Email Gateway and Advanced Email Security with Targeted Threat Protection uses multiple, sophisticated, detection engines and a diverse set of threat intelligence sources.

Trend Micro offers cloud email gateway services, including hosted email security and email security advanced, to stop malware issues before they attack.

Barracuda Essentials offers advanced Office 365 security features including email scanning, archiving, backup & recovery, and real-time phishing defense.

SolarWinds Mail Assure's cloud-based email security helps you and your customers stay in control and protect inbound and outbound email. Built-in 24/7 email continuity maintains business productivity. Seamless integration with Microsoft 365 with an easy-to-install Microsoft 365 add-in.

Secure email client with a collaborative environment, consisting of mailbox, calendar & address book, & protection against spam, phishing, ransomware, etc.

Hornetsecurity offers Best Spam Filter Service & Malware Protection - detect and block 99.99% of spam, phishing and malware. 250+ 5* Reviews on Spiceworks

Hornetsecurity 365 Total Protection was specially developed to secure the Microsoft 365 business environment with comprehensive protection for all 365 cloud services. With onboarding in seconds and extremely intuitive use, you'll simplify your IT security management with a fully integrated solution.

Email security is a critical component of any organization's IT infrastructure, as it plays a significant role in preventing phishing, malware, spam, viruses, and other malicious email threats from causing harm. SpamTitan email protection solutions provide advanced yet user-friendly email protection for businesses, with features that are designed to safeguard sensitive information and prevent cyberattacks. The software is compatible with Microsoft 365, making it an ideal option for businesses that rely on the popular productivity suite. SpamTitan's email security features include email filtering, URL filtering, attachment scanning, and advanced threat protection. With these features, businesses can ensure that their employees are protected from the myriad of email threats that exist in today's digital landscape. Overall, SpamTitan's email protection solutions provide a reliable and effective way for businesses to secure their email communications and prevent costly data breaches.

OnDMARC by Red Sift is a cloud-based application enables organizations to utilize fast automated business email protection by quickly configuring SPF, DKIM and DMARC for all legitimate email sources in weeks, not months.OnDMARC simplifies the complexities of the email security protocol, DMARC, by automating processes and providing clear instructions on how to block unauthorized use of your domain. This protects both in- and outbound business email communications with customers, suppliers and partners by blocking vendor fraud, account takeovers, and email spoofing.

Request a phishing protection demo that works for your small or medium-size business. Get Advanced Threat Defense included in all plans.

Harmony Email & Collaboration is the gold standard for enterprise email protection, trusted by both industry analysts and major businesses. It shields the cloud email from zero-day threats, malicious attachments, and even compromised QR codes. Beyond email, it offers unmatched malware and data loss prevention for platforms like SharePoint, Teams, OneDrive, Google Workspace, and Slack. With real-time prevention and historical breach detection, it stops unauthorized access before it becomes an issue, while adaptive false positive filtering ensures smooth operations. The patented unified admin console saves SOC teams valuable time by providing a single interface to review quarantined emails from both Microsoft and Check Point, allowing swift action when needed. Additionally, role-based phishing simulations help train the teams with zero configuration hassles, preparing them to handle future attacks confidently. With visibility, control, and proactive features all in one user-friendly platform, Harmony Email & Collaboration ensures a sensitive data and communications remain protected, all while simplifying the complexities of email security management.

modusCloud is a cloud email security solution with advanced threat protection, offering cloud based email archiving, continuity, encryption and DLP.

SilverSky has been helping small and mid-sized businesses in some of the most regulated industries for over twenty years. Our expert Security Operations Center watches over your email systems to keep you safe 24x7x365. Cloud Email and Collaboration offering brings Hosted Exchange, Skype, Sharepoint, Multi-Factor authentication and Mobile Device Management in an easy subscription package.

Area 1 Horizon deploys in minutes and stops phishing attacks across all traffic vectors—email, web, or network. Block phishing attacks.

Guardian Digital provides the perfect solution for enterprise Email Protection. This focused and security-oriented solutions will reduce the stress and responsibility of IT professionals who are pressed to protect their companies' data integrity and electronic communications. With Guardian Digital's service-as-a-security model, customers can rest assured that their email is always secure from even the most sophisticated threats. The team of experts understand the unique requirements for different enterprises which enables us to provide comprehensive, tailored solutions that precisely fit individual organization’s needs. And when unforeseen challenges arise, support staff is ready to help quickly resolve any issues. To make this promise a reality, go beyond email protection by offering comprehensive support services that go far beyond what would expect from a provider in the same space. Whatever needs may be, can rest assured knowing that Guardian Digital has covered. Make sure enterprise is secure with Guardian Digital today!

Email Shield is a cloud-based email security add-in which helps businesses across various industry verticals. It tracks and verifies trusted contacts, letting users expose risky emails and ensure safety of financial transactions. The application enables teams to take control of payment fraud in Outlook by screening all inbound account or wire change requests and invoice submissions.

GreatHorn's cloud email security platform allows any organization to address advanced threats at the moment risk enters your environment.

IRONSCALES, an email security platform powered by AI, have alumni backgrounds from the Israel Defense Forces’ elite Intelligence Technology unit, and have been incubated in one of the world's top venture programs for cybersecurity. This service is fast to deploy, easy to operate, and is unparalleled in its ability to detect and remove all types of email threats, including BEC, ATO, and more. IRONSCALES is the future of phishing protection.

DMARCeye! This innovative and user-friendly DMARC monitoring tool makes it easy for everyone to stay on top of their email security game. With DMARCeye, they'll have everything they need to empower and strengthen their email security. This hassle-free reporting tool takes the stress and confusion out of DMARC monitoring, allowing them to focus on what matters most protecting their emails and securing their online presence. Gone are the days of spending valuable time and resources trying to make sense of complicated reports. DMARCeye provides always up-to-date reporting, giving them peace of mind and confidence in their email security. They'll be able to easily manage their domains and have a comprehensive overview of their email security at their fingertips. But that's not all they believe in making their product accessible to everyone. That's why DMARCeye offers unlimited teams and users in every plan. Whether they're a small business or a large corporation, our product is designed to fit their needs and grow with their business.