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Best Secure Email Gateway Software in 2026

Secure email gateway software helps organizations manage and protect email traffic. This list is for people choosing a gateway on a budget, including teams considering hosted services, APIs or self-hosted deployment.

  1. 1

    Cloudflare Gateway

    Free plan AndroidAPIiPhone+4
    7.6 Free plan · paid from $7/user/mo Visit site
  2. 2

    Kerio Connect

    Free trial AndroidAPIiPhone+5

    Kerio Connect provides a broad mail and collaboration server with flexible deployment and migration options. Licensing and optional components should be reviewed alongside the requested mailbox count.

    6.3 Pricing on request · 30-day trial Visit site
  3. 3

    Microsoft Defender for Business

    by Microsoft Defender for Business
    Free trial AndroidAPIiPhone+2
    6.1 From $3/user/mo (annual) · 30-day trial Visit site
  4. 4

    Libraesva Email Security

    Free trial Self-hostedWeb

    Libraesva Email Security combines message, attachment, URL, and account-takeover protections with both self-hosted and web options. Buyers need to request pricing, while a 30-day trial is available.

    6.0 Pricing on request · 30-day trial Visit site
  5. 5

    Mailinblack Protect

    Paid APISelf-hostedWeb

    Mailinblack Protect combines inbound email filtering with link analysis and administrative controls, with deployment choices for different environments.

    5.6 Pricing on request Visit site
  6. 6

    SpamHero Business Email Security

    Free trial APIWeb

    SpamHero combines inbound filtering, quarantine, and email continuity with Microsoft 365 and Google Workspace support.

    5.6 From $7/mo (annual) · 30-day trial Visit site
  7. 7

    SpamTitan Gateway

    Free trial Self-hostedWeb

    SpamTitan Gateway combines mail-flow administration with spam analysis, antivirus engines, and outbound controls.

    5.6 From $1.95/user/mo (annual) Visit site
  8. 8

    Sophos Secure Message

    by Sophos Secure Message
    Free trial Web

    Choose Sophos Email if your organization needs inbox threat protection alongside email encryption and data loss prevention.

    5.5 Pricing on request Visit site
  9. 9

    Symantec IT Management Suite

    Paid APILinuxMac+3

    Choose Symantec IT Management Suite if you need cloud-based management across Windows, macOS, and Linux with patching, deployment, and security controls.

    5.3 Pricing on request Visit site
  10. 10

    Barracuda Message Archiver

    Paid MacWebWindows
    5.1 Pricing on request Visit site
  11. 11

    Check Point Email Security

    by Check Point Software Technologies Ltd.
    Paid Web
    4.7 Pricing on request · 14-day trial Visit site
  12. 12

    Hornetsecurity 365 Total Protection

    Free trial Web
    4.7 Pricing on request · 14-day trial Visit site
  13. 13

    Proxmox Mail Gateway

    Paid LinuxWeb

    Proxmox Mail Gateway combines outbound filtering with a consistent stated feature set across four annual support tiers. The key choice is the level of support and response time required.

    4.6 Open source · paid from €190 Visit site
  14. 14

    Forcepoint Email Security Cloud

    Paid Web
    4.5 Pricing on request Visit site
  15. 15

    FortiMail Email Security

    Paid

    FortiMail combines outbound filtering, impersonation protection, and malware sandboxing in a hybrid email security product.

    4.4 Pricing on request Visit site
  16. 16

    MDaemon SecurityGateway

    Paid WebWindows
    4.4 From $0.20/user/mo · 30-day trial Visit site
  17. 17

    Mimecast Email Security

    Paid Web
    4.2 Pricing on request · 30-day trial Visit site
  18. 18

    Trend Vision One Container Security

    Paid Web
    4.0 Pricing on request · 30-day trial Visit site

#1Places #1, #2, #3, #4, #5 on this list can be bought by the makers of the software on it. See the price

Compare free plans, trial periods and paid pricing before choosing. Review whether deployment options and needed capabilities—such as malware sandboxing, outbound DLP, email encryption, continuity spooling or archiving—are available. If you need to read or change code, check the tool's licence.

Questions

Are free plans available for secure email gateways?

Yes. A free plan is listed for Cloudflare Gateway. Other products on the list use paid or quote-based pricing, so check the plan details for the tool you want.

Which gateways offer trials?

The listed examples show 14-day trials for Check Point Email Security and Hornetsecurity 365 Total Protection, and 30-day trials for Kerio Connect, Libraesva, MDaemon and Mimecast.

What is the lowest stated paid price?

MDaemon SecurityGateway shows a starting price of $0.20 per user per month. Cloudflare Gateway's paid service starts at $7 per user per month.

Can I deploy these tools myself?

Self-hosted deployment is a listed platform option. Mailinblack Protect lists self-hosted, API and web platforms; confirm deployment details for your selected product.

Which features should I compare?

The comparison includes free-plan availability, starting paid price, deployment, malware sandboxing, outbound DLP, email encryption, continuity spooling and email archiving.

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