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Read 19 GreatHorn reviews and testimonials from customers, explore 11 case studies and customer success stories, and watch customer videos to see why companies chose GreatHorn as their Email Security Software

GreatHorn is a cybersecurity company that helps organizations detect and prevent spear phishing and credential theft attacks automatically. The first and most powerful solution for stopping business email compromise, domain imposter, and whaling attacks, GreatHorn is natively integrated into Google Apps and Office 365, deploys in 15 minutes, and requires no changes to your existing mail routing or email gateway.

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Customer Rating Review Score based on 2375 reference ratings
4.7/5.0 (2375)
  • Fall 2025 Top Performer Email Security Software
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19Testimonials

  • “GreatHorn gives us a way to empower our clients to take action on email based threats, allowing us to maintain an advisory role as cybersecurity consultants, since we are not …

    Ryan Smith Director of Sales and Customer Success

  • “GreatHorn gives you the confidence that your business, your people, and your communications are safe.”

    Jeff Kohrman Cybersecurity Senior Executive and Strategic Advisor

  • “We were one of GreatHorn’s first customers because they were the only ones who provided cloud-based answer to phishing. From the beginning, GreatHorn has provided a very unique approach to …

    Yoel Alvarez IT Security Engineer
18 more testimonials currently locked

11 Case Studies

  • Early Growth Leaps Past Email Security Problems with GreatHorn

    Stephanie McCain Director of Human Resources

  • Crossbeam Achieves Defense-in-Depth Email Security with GreatHorn

    Chris Castaldo Chief Information Security Officer

  • Saint Anselm College Defends Students, Clergy, and Staff from Targeted Phishing Attacks

    Steven McDevitt Chief Information Officer
10 more case studies currently locked

Additional GreatHorn Information & Resources

Read GreatHorn Reviews, Testimonials & Customer References from 19 real GreatHorn customers.

Browse GreatHorn Case Studies, Customer Success Stories, & Customer References from 11 businesses that use GreatHorn.

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