Best Secure Email Gateway Software

Compare the Top Secure Email Gateway Software as of November 2025

What is Secure Email Gateway Software?

Secure email gateways protect organizations from email-based threats such as phishing, malware, spam, and data breaches. They analyze incoming and outgoing messages to detect suspicious content, malicious attachments, and unauthorized data sharing. These gateways enforce email security policies, filter harmful traffic, and provide encryption to safeguard sensitive communications. Many platforms also integrate with cloud email services like Microsoft 365 and Google Workspace to extend protection across hybrid environments. Ultimately, secure email gateways help maintain compliance, protect confidential information, and ensure safe, reliable business communication. Compare and read user reviews of the best Secure Email Gateway software currently available using the table below. This list is updated regularly.

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    Sealit

    Sealit

    Sealit Technologies

    When implementing a Zero Trust security model you shouldn’t question if your accounts or devices will get get compromised - assume they will. With Sealit, the sensitive data in your emails and files will remain fully protected even in that scenario. It takes one click from your existing inbox to encrypt your sensitive emails. It takes one click to encrypt any file format on your desktop. We made sure your workflow isn’t disrupted as we add a strong layer of protection to your sensitive data. Human error accounts for over 90 percent of cyber attacks on businesses, so you need to have a system in place to minimize the risk. Our patent-pending end-to-end encryption ensures each facet of your business is protected. Our app uses biometrics as authentication which provides you a seamless protection experience. Unlike passwords, biometrics cannot be taken away from you, there’s nothing you need to remember, and you always have it with you.
  • 2
    Clearswift Secure Email Gateway
    Clearswift Secure Email Gateway (SEG) provides uniquely powerful protection of an organization's email data against inbound cyber-attacks and outbound data loss prevention. As the number one method of communication for most organizations, email has become one of the top sources for cybercriminals to infiltrate your systems and take hold of your critical data. Our Secure Email Gateway protects against known and unknown malware but also advanced threats including phishing. IT teams need to ensure that information being shared across email both in and out of the organization is not only secure, but appropriate and compliant. Clearswift’s unparalleled level of inspection and granular policy controls apply the optimal security treatment to your emails in real time so your communications remain safe and flowing, and business disruptions are minimized.
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