GreatHorn Alternatives (January 2026)

GreatHorn

Comprehensive Email Security for Microsoft 365 & Google Workspace

https://www.greathor.com/

GreatHorn is an API, cloud-native email security solution that mitigates the risk of business email compromise across Microsoft 365 and Google Workspace.

4.2/5

40+ reviews

Reviewed on:

G2
Capterra
Gartner
1.
Material Security | Cloud Email Security for Microsoft 365 and Google Workspace
https://materia
.security/

Material is a multi-layered detection and response toolkit for email. It stops sophisticated email-based attacks and contains the blast radius of compromised accounts.

2.
Cloud-Native, Advanced Email Security for Enterprises | Fortra Email Security
https://emailsecurity.fortr
.com/products/cloud-email-protection/

Cloud Email Protection, the integrated cloud email security solution from Fortra, stops advanced threats that bypass security defenses and make it into inboxes.

3.
Makes Email Safe For Business: Microsoft 365, Google Workspace.
https://guardiandigita
.com/

Guardian Digital has developed unparalleled AI-powered business cloud email security services. Secure your business emails and stay threat-ready today.

4.
Graphus | Anti Phishing Software | Cloud Email Security
https://www.graphu
.ai/

Graphus is automated email security software, providing security for Google Workspace & Microsoft 365 users against phishing & social engineering attacks.

5.
365 Total Protection - Hornetsecurity – Next-Gen Microsoft 365 Security
https://www.hornetsecurit
.com/us/services/365-total-protection/

Full suite for Microsoft 365 security, Risk, Governance, Compliance & Backup

6.
Email Security Solutions | Ransomware, Phishing & More | Cloud-Based |
https://contentcatche
.com/

Email Security, Archiving, Encryption, & Awareness Training. Compatible with Office 365. Virus, Phishing, Ransomware & Malware Protection.

7.
Trustifi: Email Security Solutions With AI-Powered Protection
https://trustif
.com/

Award-winning cloud-based email security platform prevents phishing, malware, spoofing, and BEC, from reaching a user’s mailbox. See the Trustifi Difference.

8.
Libraesva Email Security, Email Archiving, Phishing Awareness, DMARC - Libraesva
https://www.libraesv
.com/

Exceptional Email Security, Email Archiving and Phishing Awareness. Libraesva stops Zero-Day Email Attacks, integrating with M365 and Google

9.
Email Security Solutions For Cloud-Based and On Premise Protection
https://www.virco
.com/

Boost your email security with Proofpoint Essentials and OnDMARC; protect your business against phishing, ransomware, and fraud.