Your Users Already Know Which Emails Are Suspicious
Cupelon turns that instinct into organization-wide intelligence — surfacing risk signals, building sender reputation, and training everyone in the flow of their work.
Self-hosted · No outbound traffic without your permission · Deploy in 2 minutes
The Problem
Your Users Are Your Weakest Link — and Your Best Sensor
Every org has users who flag junk mail, rescue false positives, and silently judge sender domains. Right now, that intelligence goes nowhere.
Cupelon captures those signals and builds crowd-sourced domain reputation from native email behavior across your entire organization. No external feeds to buy. No blocklists to manage. The more your users interact with email, the smarter the system gets.
- Reputation built from real user behavior, not vendor feeds
- Spear phishing surfaces because your users see it first
- Each flag improves accuracy for everyone in the org
The Problem
Phishing Simulations Teach Users to Spot Fakes, Not Real Attacks
You're paying per-user simulation fees for a program your users resent and your security team dreads managing. Users learn to spot the fake emails — then miss the real ones.
Cupelon replaces simulations with inline training — educational panels injected into actual suspicious emails, at the point of attack, in the inbox. Users learn from the threats they actually receive.
- No separate portal, no gotcha campaigns
- Training appears inside real suspicious emails
- Included in paid tiers — no per-user simulation fees
The Problem
Your Security Stack Can't See What Your Users Already Know
Gateway filters and external feeds miss targeted attacks because they've never seen them before. By the time a domain appears on a blocklist, the campaign already landed.
Cupelon sees new threats because your users see them first. When one person flags a sender, contextual warning banners appear for everyone. The Cupelon Threat Network extends that intelligence across organizations.
- Color-coded banners applied retroactively when reputation changes
- Campaign clustering reveals coordinated attacks automatically
- Cross-organization intelligence through the Threat Network
Training That Happens Inside the Inbox
When a suspicious email arrives, Cupelon shows your users exactly why it's risky — link mismatches, authentication failures, reputation signals, and pressure tactics — right there in the message.
No separate portal. No scheduled campaigns. No per-user fees. Users learn from the actual emails they receive, at the moment they need to make a decision.
Learn about inline training →Phishing Training — Suspicious Email
Multiple warning signals identified
How It Works
No new workflows to learn. Cupelon observes what your users already do and turns it into intelligence that benefits everyone.
Users Interact With Email Naturally
Flag junk, rescue false positives, report suspicious messages. No new workflows to learn — Cupelon observes what your users already do.
Cupelon Builds Intelligence From Those Signals
Rolling per-domain reputation scores, campaign clustering, IOC extraction, and lookalike domain analysis — all automatic.
Risk Signals Appear in the Inbox
Color-coded warning banners, inline training panels, and contextual alerts — delivered where users make decisions, not in a separate portal.
The Whole Org Gets Smarter
Each flag improves accuracy for everyone. The Threat Network extends that intelligence across every participating organization.
Why Cupelon
An intelligence layer that adds capabilities most email security solutions don't offer.
Your Emails Never Leave Your Network
Self-hosted with no outbound traffic without your express permission. Deploy in classified environments, SCIFs, and air-gapped networks. No SaaS dependency.
Add to Your Stack Without Touching Mail Flow
Integrates via API — no MX record changes, no DNS updates, no proxy routing. Up and running without disrupting your mail flow.
Pass CMMC With a Tool Built for CUI From Day One
GCC High native. FIPS-approved algorithms, certificate auth, RBAC, and audit logging. Not a compliance wrapper bolted on after the fact.
Running Before Your Next Meeting Ends
One command to deploy. Auto-HTTPS and auto-updates out of the box. No professional services, no sales calls required.
Pricing That Doesn't Punish Growth
Transparent per-seat pricing that drops as you scale. No enterprise minimums, no hidden platform fees, no per-mailbox surcharges.
Catches the Phishing Lures Users Expect to Click
Spoofed DocuSign, Adobe Sign, and banking emails are the most dangerous because users expect to interact with them. Cupelon verifies e-signature and financial messages against curated allowlists and flags imposters instantly.
Opt Into Sharing? CUI Still Stays Local
All processing runs on your network — Cupelon never sees your data unless you opt into Threat Network sharing. If you do, an automatic compliance filter catches CUI, ITAR, and classification markings before anything is shared. The filter cannot be disabled.
One Command. Two Minutes.
Self-hosted deployment with auto-HTTPS and auto-updates out of the box. No professional services required.
Ubuntu 22.04+, Debian 11+, RHEL 8+ · 2 CPU / 4 GB RAM minimum · Air-gap install available
Start Free With Cupelon Community
Connect your Gmail and get automated mailbox scanning, risk signal banners on suspicious emails, domain assessments, and crowd-sourced threat intelligence. No credit card required.
Request AccessReady to Get Started?
Start free with Community, or pick a paid plan for warning banners, inline training, and full platform control.