Mimecast vs GreatHorn: Email Security Comparison (2026)
An independent side-by-side comparison of Mimecast and GreatHorn for email security buyers — pricing, features, integrations, and how often each is cited by major AI engines.
AI Citation Scorecard
How often each is cited by major AI engines when buyers ask email security questions. Last 90 days across ChatGPT, Perplexity, Gemini, Claude, and Copilot.
Mimecast leads overall — 60% cited vs GreatHorn 0% across 60 probes.
ChatGPT
MimecastLeads
6 / 6 probes
100%
ExcellentGreatHorn
0 / 6 probes
0%
InvisiblePerplexity
MimecastLeads
5 / 6 probes
83%
ExcellentGreatHorn
0 / 6 probes
0%
InvisibleGemini
Mimecast
0 / 6 probes
0%
InvisibleGreatHorn
0 / 6 probes
0%
InvisibleClaude
MimecastLeads
6 / 6 probes
100%
ExcellentGreatHorn
0 / 6 probes
0%
InvisibleCopilot
MimecastLeads
1 / 6 probes
17%
AverageGreatHorn
0 / 6 probes
0%
InvisibleScale:NoneLowFairStrongExcellent
Probes run hourly; each (engine × query) combo retests every ~3 days.
Pricing
Key Features
Mimecast
Feature data is being indexed.
GreatHorn
Feature data is being indexed.
When to choose Mimecast
Choose Mimecast if your team prioritizes its strengths over GreatHorn's. Full guidance populates as Mimecast's feature data is indexed.
When to choose GreatHorn
Choose GreatHorn if your team prioritizes its strengths over Mimecast's. Full guidance populates as GreatHorn's feature data is indexed.