Email security that explains every decision.
Intent-based detection for Microsoft 365, Google Workspace, and any on-premise mail server — with human-readable reasoning behind every verdict.
We catch what legacy filters trust: fully authenticated phishing, first-time senders, and behavioral anomalies. Then we show you exactly why.
mx1.openefa.comEmail Security Experts Serving US & International Clients
Processing Thousands of Emails Daily Years of Proven Experience Global Protection
Trusted by Law Firms, Publishing Companies, Insurance Agencies & More
Chipotle Publishing
Phoenix Defence
RD Johnson Law
Esudo Law
Safe and Sound Insurance
Segue Logic LLC
With Love & Co.
...and more
From Indicators to Intent: The Evolution of Email Defense
Our first annual report examines how email threats have evolved from bulk nuisance into sophisticated AI-assisted deception — and why the industry must shift from indicator-based detection to intent-aware, behavioral defense. 24 pages of research, predictions, and actionable recommendations.
"We switched from Barracuda and the difference was immediate. False positives dropped to near zero, and the transparency into why emails are blocked is something we never had before."
— IT Director, Law Firm
"Setup took five minutes. We pointed our MX records and it just worked. The AI catches phishing attempts that our previous filter missed completely."
— Managing Partner, Insurance Agency
"The flat-rate pricing made budgeting simple. No surprises as we added mailboxes. Support has been exceptional — real people who understand email security."
— Operations Manager, Publishing Company
Email is still the most targeted attack vector.
OpenEFA Cloud provides a fully managed, AI-enhanced security layer between the internet and your mail system—ensuring only safe, legitimate messages reach your users.
Dramatically fewer false positives than legacy spam filters
Fully managed platform with instant deployment
Works with all cloud email services (MS 365, Google, Zoho, etc.) and on-premise servers
Explainable filtering decisions with detailed scoring
Legacy filters rely on reputation, signatures, and authentication. Modern attackers pass all three — and legacy filters deliver the mail.
An attacker compromises a real Microsoft 365 mailbox. SPF, DKIM, and DMARC all pass. Sender reputation is clean.
LEGACY FILTERS
Deliver. “It’s signed, it’s from a trusted tenant.”
OPENEFA
Flag. Intent classifier detects financial urgency, first-contact relationship, and BEC patterns.
Fresh domain, no sender reputation, no blocklist hits. The target has never received a message from this address.
LEGACY FILTERS
Deliver. “No negative signals to score against.”
OPENEFA
Score. Relationship graph shows zero prior contact; behavioral baseline raises the threshold.
A legitimate invoice gets quarantined. The admin opens the vendor console and gets a single opaque risk score.
LEGACY FILTERS
“Score: 8.4. High risk.” No breakdown. No tuning.
OPENEFA
Full rule breakdown — signals fired, weights, reasoning. Tune per-domain in one click.
Four layers of analysis, running in sequence on every message. Signals that pass Layer 01 still face Layers 02, 03, and 04 — which is how we catch attacks legacy filters miss.
Authentication, reputation, and known-bad lookups.
SPF · DKIM · DMARC validation · Real-time threat intelligence · RBL checks · URL risk scoring · Attachment antivirus
Sender relationships and organizational patterns.
Sender relationship graph · First-contact detection · Volume & timing anomalies · Display-name analysis · Per-domain baselines
What is the message actually trying to do?
NLP intent classification · Urgency markers · Credential harvesting cues · Financial & wire language · Business Email Compromise (BEC) patterns
Explainable scoring — with every weight visible.
Machine-learning ensemble · Per-rule contribution · Human-readable verdict · Per-domain tuning · Full audit trail
F1 Accuracy
Precision
Processing Time
False Positives
(Industry avg: 15-25%)Most email security vendors send your messages to third-party cloud AI platforms for analysis—exposing your confidential communications, client relationships, and business intelligence to external systems.
OpenEFA is different. Our proprietary machine learning runs entirely within our controlled infrastructure. Your email data never leaves to train external AI models or feed cloud ML services. Your business relationships, client contacts, and sensitive communications remain private—not shared with big tech AI projects.
Enterprise-grade protection. Zero data exposure.
When a message is quarantined, blocked, or delivered, OpenEFA shows exactly why — down to the rule, the weight, and the evidence.
FROM
ceo@acme-corp.co ⚠
SUBJECT
Urgent: wire transfer needed before 2pm
Signals that fired
Illustrative verdict breakdown from mailguard.openefa.com
No appliances, patches, or maintenance. Just point your MX records to mx1.openefa.com and your organization is protected instantly.
Setup time: Under 5 minutes
Every filtered email includes:
You see exactly why a message was blocked or delivered.
Cloud-hosted email services:
On-premise mail servers:
Simple per-user pricing from $5/user/month. No long-term contracts, no vendor lock-in. Archiving included in higher tiers — not a costly add-on.
Alternative to: Barracuda, Mimecast, Proofpoint at a fraction of the cost
Most customers choose our cloud-hosted email security service
We handle all server maintenance, updates, and monitoring
Continuous threat intelligence updates protect against emerging attacks
99.9% uptime with redundant infrastructure
Filtering engine improvements deployed automatically
Shared learning across all protected domains
Manage quarantine, whitelist, and train AI at mailguard.openefa.com
This is the fastest, easiest, most powerful version of OpenEFA.
Get Started with CloudFor organizations with regulatory compliance, data residency, or security requirements—we deploy OpenEFA at your location while we handle all management, updates, and monitoring:
Physical hardware deployed at your location for regulatory compliance—fully managed and updated by OpenEFA remotely.
OpenEFA deployed in your private cloud infrastructure—managed remotely by our team:
Isolated systems for maximum security—with on-site or secure remote management:
All deployment options include full management by OpenEFA.
You get the compliance and data residency you need, without the IT overhead. Contact us to discuss on-premise or private deployment options.
A powerful, scalable platform designed for multi-tenant environments
Manage multiple customers from a single interface
Granular permissions and customer isolation
Per-customer filtering policies and learning
Automate provisioning and management
White-label reports for clients
Predictable costs as you grow
No hidden fees. No long-term contracts. Cancel anytime.
per user / month
Full AI email security
No archiving
per user / month
Everything in Secure
+ 1 year email archiving
per user / month
7 year retention
Legal hold & compliance
per user / month
Indefinite retention
Full compliance suite
"Open" means transparent. OpenEFA is a proprietary, commercial platform — but we believe security works best when customers can see exactly what's happening to their email. That means:
Most email security vendors operate as a black box — you hand them your email and hope for the best. OpenEFA takes the opposite approach: we show you everything.
OpenEFA delivers a modern, flexible, and transparent alternative to legacy email security gateways.
Interested in a demo, pricing information, or deploying OpenEFA? Let us know below.
OpenEFA provides advanced AI-powered email security, cloud-hosted spam filtering, phishing protection, and threat detection for businesses of all sizes. Our platform integrates with all cloud-hosted email services including Microsoft 365, Google Workspace, Zoho Mail, Rackspace Email, FastMail, and any email provider. We also support all on-premise mail servers including Exchange, Zimbra, Xeams, Postfix, Dovecot, Sendmail, Exim, Qmail, and more. As a modern alternative to legacy email security gateways like Barracuda, Mimecast, and Proofpoint, OpenEFA delivers higher accuracy, better transparency, and flexible deployment options including cloud, on-premise, and private infrastructure. With support for DMARC, SPF, DKIM validation, AI-based filtering, NLP analysis, and real-time threat intelligence, OpenEFA ensures reliable protection against modern email-borne threats including spam, phishing, business email compromise (BEC), malware, and spoofing attacks.