Credential Theft


Comprehensive Threat


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

Jeff Kohrman

Founder and CEO, eCISO

Innovative Companies Trust GreatHorn

“I used to worry about email as a threat vector. But since we started working with GreatHorn, email security doesn’t keep me up at night.”

Jason Shane, Vice President of IT at Hersha Hospitality Management

See customer story >

Combat Phishing with Modern Email Security

Download whitepaper >

Live Webinar on December 10 @ 2 pm EST: An Intro to GreatHorn

Save my spot >

2019 Email Security Trends, Challenges, and Benchmarks Research

Access report >

GreatHorn combines patented threat detection, continuous monitoring, end-user education, and integrated remediation capabilities into one, comprehensive platform.


Adaptive, anomaly-based protection from phishing and social engineering attacks. GreatHorn learns your individual communication patterns, adjusting to identify deviations typical of attack patterns.


Provide your employees with greater security awareness and customized controls to empower and transform them into valuable components of your organization’s defense strategy.


No more PowerShell scripts. Simplify email incident response with GreatHorn’s one-click removal and claw-back, post-delivery monitoring, and automated threat management.

Phishing emails, explained: “New Voicemail Message!”

In GreatHorn’s blog series, “Phishing Emails, Explained,” we take a closer look at real-world phishing emails and the tactics cybercriminals use to lure...

Why an API approach to securing email in the cloud is better than the secure email gateway method

The term “cloud-native” gets thrown around a lot, but in email security there are very few cloud-native solutions. It’s crucial to understand the...

Phishing Emails, Explained: “Action Required – Mail Sync Error!”

This is the first post in our new blog series, "Phishing Emails, Explained." In this series, we'll take a closer look at real-world phishing examples and...

Where to Find GreatHorn This Fall

Face-to-face conversations are one of our favorite ways to really understand what’s happening in your world – the challenges at the top of your list, the...

Lessons Learned: Helping the hospitality industry manage information security and fluctuating workforces

I recently had the opportunity to interview the Vice President of IT Jason Shane and Sr. Security Engineer Yoel Alvarez of Hersha Hospitality Management....