TL;DR

• Cloud-based email security tools protect businesses from phishing, malware, ransomware, and spam.

• Tools like Proofpoint and Mimecast offer advanced threat detection and AI-powered filtering.

• The right solution depends on your company size, compliance requirements, and email provider.

Email remains the #1 attack vector for businesses.

Phishing, ransomware, spoofing, and business email compromise attacks are more sophisticated than ever. If you're using Microsoft 365 or Google Workspace, built-in protection is helpful but often not enough for growing companies.

Cloud-based email security tools add an advanced layer of protection without requiring on-premise hardware. They filter threats before emails even reach your inbox.

Here are the 10 best cloud-based email security tools you should consider.

What is a cloud-based email security tool?

A cloud-based email security tool is a security solution that protects your email environment from cyber threats such as phishing, malware, ransomware, spam, and spoofing.

These tools typically provide:

• Advanced threat detection

• AI-based phishing protection

• Malware and ransomware filtering

• URL and attachment scanning

• Data loss prevention (DLP)

• Email encryption

• Compliance monitoring

They integrate with platforms like Microsoft 365 and Google Workspace.

Guidelines we used to choose these tools

Choosing an email security solution requires balancing protection, usability, and cost.

Here’s what we evaluated:

1. Threat detection accuracy

The tool must effectively block phishing, malware, and spoofing attacks.

2. Integration

Seamless integration with Microsoft 365 and Google Workspace is essential.

3. Advanced protection features

Sandboxing, AI detection, DLP, and encryption are key for modern security.

4. Ease of management

The admin dashboard should be intuitive and manageable.

5. Pricing and scalability

Solutions should support both small teams and enterprises.

Quick overview of the 10 best cloud-based email security tools

10 Best Cloud-Based Email Security Tools

1. Proofpoint

Best for Enterprise-grade protection. Proofpoint is widely used by large enterprises for advanced threat protection and compliance. It offers AI-driven phishing detection, email encryption, and detailed threat intelligence.

Key features

• Advanced phishing and BEC detection.

• AI-powered threat intelligence.

• Data loss prevention tools.

• Email encryption and compliance support.

Pros and cons

• Extremely strong enterprise protection.

• Excellent compliance features.

• Pricing is custom and enterprise-focused.

• Can be complex to configure.

Pricing

Reviews

“Proofpoint provides advanced threat protection and gives us strong visibility into email-based threats.”

— G2 Reviewer 

2. Mimecast

Best for Comprehensive email security. Mimecast provides end-to-end email security, archiving, and continuity solutions. It is known for strong protection against phishing and ransomware.

Key features

• Email threat protection.

• URL and attachment sandboxing.

• Email continuity during outages.

• Archiving and compliance tools.

Pros and cons

• Comprehensive solution.

• Strong brand reputation.

• Custom pricing.

• Interface can feel complex.

Pricing

Reviews

“Mimecast gives us peace of mind with its strong phishing and malware protection.”

— G2 Reviewer 

3. Barracuda Networks

Best for Mid-sized businesses. Barracuda Email Protection offers advanced threat detection and is easier to deploy than many enterprise tools.

Key features

• AI-based phishing detection.

• Account takeover protection.

• Email encryption.

• Real-time threat intelligence.

Pros and cons

• Easy to deploy.

• Affordable pricing for SMBs.

• Less advanced than enterprise tools.

• Limited deep customization.

Pricing

Reviews

“Barracuda is easy to manage and provides reliable email protection.”

— G2 Reviewer 

4. Microsoft (Microsoft Defender for Office 365)

Best for Microsoft ecosystem users. Microsoft Defender for Office 365 integrates natively with Microsoft 365, providing advanced threat protection within the ecosystem.

Key features

• Safe Links and Safe Attachments.

• Anti-phishing policies.

• Threat investigation dashboard.

• Automated incident response.

Pros and cons

• Seamless Microsoft integration.

• Affordable pricing.

• Limited protection outside Microsoft ecosystem.

• May require configuration expertise.

Pricing

Reviews

“Defender integrates seamlessly with Office 365 and provides solid protection.”

— G2 Reviewer 

5. Cisco (Cisco Secure Email)

Best for Advanced enterprise security. Cisco Secure Email provides advanced threat detection, URL protection, and malware defense for large enterprises.

Key features

• Advanced malware protection.

• URL filtering and sandboxing.

• Threat intelligence integration.

• Secure email gateway.

Pros and cons

• Strong enterprise security.

• Backed by Cisco threat intelligence.

• Higher cost.

• Complex setup.

Pricing

Reviews

“Cisco Secure Email provides powerful protection against advanced threats.”

— G2 Reviewer 

6. Trend Micro

Best for AI-powered threat detection. Trend Micro Email Security uses machine learning to detect advanced threats and protect cloud email platforms.

Key features

• AI-based phishing detection.

• Attachment sandboxing.

• Anti-spam filtering.

• Data loss prevention.

Pros and cons

• Strong AI detection.

• Easy integration with cloud platforms.

• Custom pricing.

• Limited UI customization.

Pricing

Reviews

“Trend Micro does a great job catching phishing emails before they reach users.”

— G2 Reviewer 

7. Check Point (Avanan)

Best for Cloud-native email security. Avanan, now part of Check Point, is built specifically for cloud environments and integrates seamlessly with Microsoft 365 and Google Workspace.

Key features

• AI-based phishing protection.

• Inline API integration.

• Malware and ransomware detection.

• Account takeover protection.

Pros and cons

• Cloud-native architecture.

• High detection accuracy.

• Custom enterprise pricing.

• Less suitable for very small teams.

Pricing

Reviews

“Avanan provides excellent protection with minimal disruption to users.”

— G2 Reviewer 

8. SpamTitan

Best for Budget-friendly protection. SpamTitan offers affordable and reliable email filtering for small and medium businesses.

Key features

• Spam and malware filtering.

• Anti-phishing protection.

• Email encryption.

• Easy cloud deployment.

Pros and cons

• Very affordable.

• Easy to manage.

• Fewer enterprise features.

• Limited advanced reporting.

Pricing

Reviews

“SpamTitan is cost-effective and blocks most spam effectively.”

— G2 Reviewer 

9. IRONSCALES

Best for Anti-phishing specialist. IRONSCALES focuses heavily on phishing detection using AI and behavioral analysis.

Key features

• AI-driven phishing detection.

• Automated incident response.

• Security awareness training.

• Microsoft 365 integration.

Pros and cons

• Strong phishing detection.

• Automated response workflows.

• Custom pricing.

• Narrower feature scope than full gateways.

Pricing

Reviews

“IRONSCALES dramatically reduced phishing emails in our organization.”

— G2 Reviewer 

10. Fortinet (FortiMail)

Best for Advanced DLP and encryption. FortiMail provides powerful data loss prevention, encryption, and anti-phishing tools for enterprises.

Key features

• Data loss prevention policies.

• Email encryption tools.

• Advanced threat detection.

• Integration with Fortinet security ecosystem.

Pros and cons

• Strong compliance features.

• Good integration with Fortinet tools.

• Enterprise-focused pricing.

• More complex to manage.

Pricing

Reviews

“FortiMail offers strong DLP and encryption for enterprise environments.”

— G2 Reviewer 

Conclusion

Email security is no longer optional.

Cloud-based email security tools provide an essential layer of protection against phishing, malware, and account compromise. Whether you are a small business or a large enterprise, investing in the right solution can prevent costly breaches.

Start with your ecosystem. If you use Microsoft 365, Defender may be enough. For higher-risk environments, enterprise tools like Proofpoint or Mimecast provide stronger protection.