Duo Security is a comprehensive identity and access management (IAM) platform providing multi-factor authentication (MFA), single sign-on (SSO), device trust, and identity threat detection. Founded in 2010, Duo was acquired by Cisco in 2018 and now serves over 100,000 customers globally with 1.3 billion+ monthly user authentications. The platform emphasizes phishing-resistant security combined with frictionless user experience, offering solutions tailored for enterprises, SMBs, government agencies, and managed service providers across multiple industries. Signal Plug searches live against duo.com's mail server to find and verify email addresses for any Duo Security employee.
Signal Plug searches live against duo.com's mail server — not a static database. Get a verified email for any Duo Security employee with confidence score in under 2 seconds.
94% accuracy · No credit card required · 10 free searches/month
Duo Security is a comprehensive identity and access management (IAM) platform providing multi-factor authentication (MFA), single sign-on (SSO), device trust, and identity threat detection. Founded in 2010, Duo was acquired by Cisco in 2018 and now serves over 100,000 customers globally with 1.3 billion+ monthly user authentications. The platform emphasizes phishing-resistant security combined with frictionless user experience, offering solutions tailored for enterprises, SMBs, government agencies, and managed service providers across multiple industries.
Competitive Advantage
Duo processes 1.3 billion+ monthly user authentications across 100,000 global customers, demonstrating massive scale in the identity security market. The platform achieved a 198% return on investment in Forrester's 2025 Total Economic Impact study, quantifying business value for enterprises. Duo was founded by Stanford-adjacent security researchers and rapidly scaled from 2,000 customers by 2015 to 100,000+ today, showing 50x growth in a decade. The company emphasizes passwordless and phishing-resistant authentication as core differentiators rather than traditional MFA, reflecting modern security threats.
The most commonly verified format at Duo Security:
High ConfidenceSignal Plug tests all common patterns against Duo Security's live mail server and returns whichever passes the SMTP check.
Run a live search for Duo Security →Data-driven signals to help you prospect Duo Security effectively.
Duo targets enterprise security teams, identity administrators, and CISOs seeking advanced MFA and identity governance solutions. The platform appeals to organizations prioritizing phishing-resistant authentication without user friction, particularly those managing distributed workforces and requiring compliance across federal, state, and local government sectors.
Primary Contact
Chief Information Security Officer
Tuesday–Thursday, 9am–11am
Signal Plug performs live SMTP verification against duo.com's mail server — not a static scraped database — which means results reflect the real, current state of Duo Security's email infrastructure. Here's how to run a lookup:
Create a free account
Sign up at Signal Plug in under 30 seconds. No credit card required. The Free plan includes 10 searches per month so you can test the tool with real Duo Security contacts before upgrading.
Enter the contact's name
Type the first and last name of the Duo Security employee you want to reach. Signal Plug handles all seniority levels, from C-suite to individual contributors.
Enter the domain
Use duo.com. Signal Plug tests all common naming patterns automatically and returns only the format that passes the SMTP check.
Get a verified result
Signal Plug returns an email address with a confidence score (0–100) and deliverability status (Valid, Risky, or Catch-all) within 2 seconds. The confidence score tells you how reliable the result is before you use it.
Export and use
One-click CSV export lets you bring Duo Security contacts into Salesforce, HubSpot, Outreach, Lemlist, or any other tool in your stack. Growth and Scale plan users can run bulk lookups across an entire list of Duo Security names in a single batch.
Duo Security competes directly with Okta, Microsoft Entra ID, Ping Identity and others in the Technology space.
| Company | Size | Tier | Focus | Email Format |
|---|---|---|---|---|
| Duo Security | Cybersecurity, Identity and Access Management | firstname.lastname | ||
| Okta | — | — | — | firstname.lastname |
| Microsoft Entra ID | — | — | — | firstname.lastname |
| Ping Identity | — | — | — | firstname.lastname |
| Auth0 | — | — | — | firstname.lastname |
| Fortinet | — | — | — | firstname.lastname |
Whether you're running outbound sales, recruiting, or building a partnership list, these are the roles most frequently contacted at Technology like Duo Security.
Based on Duo Security's profile, the highest-value contacts for outbound are:
Signal Plug works for any role at any seniority level at duo.com. If you have a name and the domain, you can find a verified email.
How well Duo Security fits a typical B2B outbound pipeline, based on available signals.
Strong Fit
Funnel Fit Score
Most email finder tools pull from static databases of scraped email addresses. These databases go stale as people change jobs and companies update their email infrastructure. Signal Plug takes a different approach: every search performs a live check against duo.com's mail server using SMTP verification. This means results reflect the current state of Duo Security's email system — not a cached result from months or years ago.
Signal Plug enriches every result with supporting data: a confidence score (0–100), deliverability status (Valid, Risky, or Catch-all), job title where available, and LinkedIn profile URL. This context helps you prioritize which Duo Security contacts to email first and personalize your outreach before you hit send. Plans start at $29/month for 500 searches — no annual contracts or seat fees.
Signal Plug performs a live SMTP check against duo.com's mail server for every query — not a static database lookup. Our platform-wide accuracy rate is 94%. Each result comes with a confidence score (0–100) so you can gauge reliability before using the address.
Free plan: 10 searches. Starter ($29/mo): 500. Growth ($149/mo): 2,000. Scale ($299/mo): 5,000. No company-specific caps.
No. Signal Plug generates and verifies emails in real time via SMTP checks — no static database of Duo Security employee emails is maintained.
Yes. Growth and Scale plan users can upload a CSV of names and run bulk lookups against duo.com in a single batch.
Duo Security is a comprehensive identity and access management (IAM) platform providing phishing-resistant MFA, SSO, device trust, and identity intelligence solutions owned by Cisco.
Duo offers Multi-Factor Authentication, Single Sign-On, Duo Directory, Duo Passport, Passwordless Authentication, Device Trust, and Cisco Identity Intelligence for threat detection and response.
Duo serves over 100,000 customers globally and processes 1.3 billion+ monthly user authentications.
Duo Security was founded in 2010 by Dug Song and Jon Oberheide in Ann Arbor.
Signal Plug searches in real time against duo.com's mail server to find and verify email addresses for Duo Security employees. Enter a name, enter the domain, get a verified result with a confidence score in under 2 seconds.
Start finding emails free →10 free searches · No credit card required · Upgrade from $29/month