MailGuard
AI-powered cloud email security that stops threats up to 48 hours faster
Founded
2001
Starting Price
From $3
Category
Security & IT
Last updated March 25, 2026
About MailGuard
MailGuard is the world's largest private SaaS cloud email security company, founded in Australia in 2001. Using proprietary heuristic algorithms enhanced with machine learning and generative AI, it detects and blocks zero-day email threats like phishing, ransomware, and business email compromise hours before legacy vendors — seamlessly layering on top of Microsoft 365 and Google Workspace.
Pros & Cons
Pros
- Detects zero-day email threats up to 48 hours faster than Microsoft 365 native protection alone
- No software to install — fully cloud-native with simple MX record deployment
- 20+ years of email security expertise with a proven track record since 2001
- Co-built with Microsoft for seamless M365 integration without conflicts
- Australian-owned and operated — ideal for organizations with data sovereignty requirements
Key Features
Zero-Day Threat Detection
Proprietary heuristic and ML-powered engine catches emerging phishing, ransomware, and BEC attacks up to 48 hours faster than traditional vendors
Microsoft 365 Integration
MailGuard 365 is co-built with Microsoft, stacking seamlessly on top of Exchange Online Protection and Defender
Google Workspace Support
Compatible with Google Workspace email environments for multi-platform protection
No Software Installation
100% cloud-native — no agents, patches, or updates to manage. Deploy in minutes via MX record change
Business Email Compromise Protection
Advanced detection of spear-phishing and CEO fraud attempts using behavioral analysis and AI
Real-Time Threat Intelligence
Continuously updated threat intelligence from MailGuard's global detection network
Email Continuity
Ensures email availability even during Microsoft 365 or Google Workspace outages
Pricing
MailGuard 365
From $3/user/month
- Zero-day threat detection
- Microsoft 365 integration
- Phishing & BEC protection
- Ransomware blocking
- Admin dashboard
Best For
Microsoft 365 Email Security Layer
Add advanced threat detection on top of Exchange Online Protection to catch phishing and malware that Microsoft misses
MSP Client Protection
Managed service providers can offer MailGuard as a white-label email security layer for their SMB clients
Business Email Compromise Prevention
Protect executives and finance teams from sophisticated CEO fraud and spear-phishing attacks
Australian Data Sovereignty
Organizations needing Australian-owned, locally operated email security for compliance and data residency requirements
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