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Best Email Security Gateways in 2026
Email security gateways cover protections for incoming and outgoing mail. Compare support for Google Workspace and Microsoft 365 alongside impersonation protection, malware sandboxing, and outbound filtering to see which capabilities match your email environment. Deployment model, free-plan availability, and the paid-from price are also stated comparison points. The ranked entries begin with VM Backup and Proxmox Backup Server, then Sublime Security. Consider which platforms you use and which listed protections matter most to you.
- 35 apps
- Research read 23 Sept 2026
- How the order is worked out
- 1
Hermes Secure Email Gateway
Free plan Open source LinuxSelf-hostedWebChoose Hermes if you need a self-hosted email gateway or mail server with filtering, authentication controls, encryption, and bundled collaboration.
- 2
Rspamd
Free plan Open source APILinuxMac+2Rspamd offers a self-hosted email filtering engine with multiple authentication checks, malware integrations, and custom rule options.
- 3
Mailprotector
Free plan APIWebMailprotector brings filtering, encryption, and archiving products together for MSPs. Check Shield's Microsoft 365 limitation and request product pricing before choosing.
- 4
MailScanner
Free plan LinuxSelf-hostedMailScanner provides gateway-level scanning for email and links to setup guidance for several mail transfer agents and Linux families.
- 5
Scrollout F1
Free plan LinuxSelf-hostedWindowsScrollout F1 offers a free gateway with mail authentication, filtering, routing, and quarantine controls. Check platform compatibility and installation requirements before choosing it.
- 6
Xeams
Free plan APILinuxMac+3Xeams combines mail-server functions with layered spam filtering, quarantine, and administration tools.
- 7
Spamihilator
Free plan WindowsSpamihilator offers layered filtering, user training, and a recoverable Recycle Bin for supported Windows email clients.
- 8
IRONSCALES Email Protect
Free trial AndroidAPIiPhone+1Choose IRONSCALES Email Protect if you need cloud email threat detection and automated remediation for Microsoft 365 or Google Workspace.
- 9
GFI MailEssentials
Free trial Self-hostedWindowsMailEssentials provides layered filtering, malware scanning, and configurable email rules for Windows server deployments.
- 10
Cisco Catalyst Center
Paid APILinuxMac+3 - 11
EuropeanMX
Free trial WebEuropeanMX combines inbound filtering, outbound safeguards, and optional archiving in a cloud-managed service.
- 12
Libraesva Email Security
Free trial Self-hostedWebLibraesva 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.
- 13
Sublime Security
Free plan Web - 14
Abnormal Email Security
Paid APIWebAbnormal combines behavioral threat detection with investigation, phishing analysis and graymail filtering.
- 15
INKY Email Security
Free trial WebChoose INKY if you need cloud email protection for Microsoft 365 or Google Workspace, especially with user guidance or the broader Pro controls.
- 16
Darktrace / EMAIL
Paid APIWebDarktrace / EMAIL combines behavioral threat detection with response options and coverage beyond inbound email. Pricing requires a request, while a 30-day trial is listed.
- 17
SpamHero Business Email Security
Free trial APIWebSpamHero combines inbound filtering, quarantine, and email continuity with Microsoft 365 and Google Workspace support.
- 18
Sophos Secure Message
by Sophos Secure MessageFree trial WebChoose Sophos Email if your organization needs inbox threat protection alongside email encryption and data loss prevention.
- 19
SpamTitan Gateway
Free trial Self-hostedWebSpamTitan Gateway combines mail-flow administration with spam analysis, antivirus engines, and outbound controls.
- 20
Symantec IT Management Suite
Paid APILinuxMac+3Choose Symantec IT Management Suite if you need cloud-based management across Windows, macOS, and Linux with patching, deployment, and security controls.
- 21
Paubox Email Encryption
Paid WebChoose Paubox Email Encryption if your team needs link-based encrypted email, password verification, and Outlook or Gmail integration.
- 22
Barracuda Message Archiver
Paid MacWebWindows - 23
Cloudflare Email Security
Paid WebCloudflare Email Security covers email filtering, impersonation defense, attachment analysis, and isolation across several paid plans.
- 24
- 25
Hornetsecurity 365 Total Protection
Paid Web
#1Places #1, #2, #3, #4, #5 on this list can be bought by the makers of the software on it. See the price
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