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GreatHorn

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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 2435 reference ratings
4.7/5.0 (2435)
  • Fall 2025 Top Performer Email Security Software

19Testimonials

  • “Spend time in a Techstars office, and you’ll likely hear someone say, “Do More Faster” – one of our favorite phrases. GreatHorn’s fully automated policy engine keeps us secure while …

  • “We achieved a 90% reduction in remediation time after implementing GreatHorn.”

  • “Incorporating GreatHorn into our daily work lives was seamless, and there was no downtime incurred by our users.”

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11 Case Studies

  • Techstars - Customer Case Study

  • Hersha Hospitality Management Closes Email Security Gap

  • Rigid Bits Leverages GreatHorn for Email Security That Helps the Client Work

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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.