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GreatHorn vs Tessian Clear Offer
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Evidence sheet Focus
Email Security
Email Security
Product
Cloud-native email security for Microsoft 365 and Google Workspace using relationship analytics to stop spear phishing and BEC.
Tessian provides AI-powered email security that prevents accidental data loss, phishing attacks, and misdirected emails by understanding human communication patterns.
Headquarters
Waltham, Massachusetts
London, United Kingdom
Company size
51-200 employees
201-500 employees
Source updated
Oct 29, 2026
Oct 29, 2026
Capabilities
Plan capabilities
Integrations
Buyer fit
Best for
Company size
Security and switching
Security reviews
Security and migration
Case studies and sources
Case studies
Customer evidence
Open the full comparison Plan limits, integrations, security reviews and case studies for every product you compare.
Email Security Product Category Price Offer
ProtonMail End-to-end encrypted email service based in Switzerland offering zero-access encryption and ano… Email Security $3.99+ / month $3.99+ / month Guardsquare Mobile app protection platform providing code hardening, RASP, and threat monitoring for mobile… Email Security Egress KnowBe4-acquired intelligent email security platform preventing inbound phishing attacks and ou… Email Security Material Security Material Security secures cloud email and collaboration environments with controls built around… Email Security $4+ / seat / month $4+ / seat / month Tutanota End-to-end encrypted email service offering private and secure email with German data protectio… Email Security $3.36+ / month $3.36+ / month Mailfence Belgian secure email with OpenPGP encryption, calendar, contacts, and documents. Email Security Zix Email security platform providing encryption, DLP, and threat protection for regulated industri… Email Security Vipre Email Security SMB-focused email security suite offering inbound filtering, encryption, archiving, and attachm… Email Security $1.25+ / user / month $1.25+ / user / month Vade Predictive email security for Microsoft 365 and MSPs Email Security Mail-tester Spam checker tool analyzing email content, SPF, DKIM, and sender reputation. Email Security $8+ / month $8+ / month Startmail Dutch private email with PGP encryption, aliases, and disposable addresses. Email Security AppRiver Email security and M365 services acquired by Zix and OpenText Email Security GreatHorn alternatives Tessian alternatives 
