
From G2
6 Best Cloud Email Security Platform Choices: My 2026 Picks
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G2 Grid® Report · Summer 2026
Best Cloud Email Security Platforms
Updated May 26, 2026 View full category
This guide was last updated on March 4, 2026. A newer report has since been published. The tools below reflect the scores from G2's Summer 2026 Grid® Report.
1
Acronis Cyber Protect CloudLeader
★★★★★★★★★★4.7
All-in-One PlatformDisaster Recovery Complex For New Users
2
Proofpoint Core Email Protection
★★★★★★★★★★4.6
Phishing & Malware BlockingQuarantine Controls False Positives
3
Check Point Harmony Email & Collaboration
★★★★★★★★★★4.6
Phishing & Malware DefenseMicrosoft 365 Integration False Positives
4
Barracuda Email Protection
★★★★★★★★★★4.4
Phishing & Malware BlockingData Loss Prevention Search Limitations
5
PauboxEasiest to Use
★★★★★★★★★★4.9
Seamless HIPAA CompliancePeace Of Mind Higher Pricing
6
Coro Cybersecurity
★★★★★★★★★★4.7
Quick SetupSingle Dashboard False Positives
7
Abnormal AI
★★★★★★★★★★4.8
Stops Sophisticated PhishingFast Setup Premature New Modules
8
Mimecast Advanced Email SecurityContender
★★★★★★★★★★4.4
Impersonation DefenseMicrosoft 365 Integration Steep Learning Curve
9
Guardz
★★★★★★★★★★4.6
Single Pane Of GlassSecurity Awareness Training Limited Customization
10
Hornetsecurity 365 Total Protection
★★★★★★★★★★4.6
Spam & Phishing FilteringPermission Manager Complex Initial Setup
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The tools below have also been exhaustively tested and evaluated, and continue to hold their place among the best Cloud Email Security Platforms on G2.
It’s 2026, and the headlines all say the same thing: Phishing has only become more sophisticated and harder to spot.
Email and phishing attacks are still common and act as the front door to most cybersecurity attacks. I see it constantly: phishing getting more convincing, BEC attacks slipping past basic filters, and IT teams stuck explaining why their native protection wasn’t enough.
If you’re responsible for email security, I can understand that the pressure is real, regardless of whether you’re protecting a global enterprise or a fast-moving SMB. I also understand that this turns quite cumbersome when you are expected to secure quietly, perfectly, and without slowing anyone down.As part of my work analyzing tools and software performance, I’ve come across how costly email-based attacks can be. I know the stakes are high. To cut through vendor noise, I leaned heavily on G2 Data, including Grid Reports, satisfaction scores, and hundreds of verified user reviews to collate the best cloud email security platform. I focused on how real teams describe day-to-day protection, ease of management, deployment experience, and overall value.The result is a practical, buyer-focused view of what actually works in 2026, based on how teams are using these tools in the real world. Here are my top six picks for the best cloud email security platform tools: Proofpoint Core Email Protection, Mimecast Advanced Email Security, Microsoft Defender for Office 365, Paubox, Acronis Cyber Protect Cloud, and Coro Cybersecurity.
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