# GreatHorn Mailbox Intelligence vs KnowBe4 DefendTM Advanced Inbound Email Threat Defense: side-by-side comparison (2026) [GreatHorn Mailbox Intelligence](https://cybersectools.com/tools/greathorn-mailbox-intelligence) is a commercial [Anti-Phishing](https://cybersectools.com/categories/anti-phishing) solution by [GreatHorn](https://cybersectools.com/companies/greathorn). [KnowBe4 DefendTM Advanced Inbound Email Threat Defense](https://cybersectools.com/tools/knowbe4-defendtm-advanced-inbound-email-threat-defense) is a commercial [Anti-Phishing](https://cybersectools.com/categories/anti-phishing) solution by [KnowBe4](https://cybersectools.com/companies/knowbe4). Features, integrations, deployment and the company behind each one, side by side. ## Side-by-side comparison | | GreatHorn Mailbox Intelligence | KnowBe4 DefendTM Advanced Inbound Email Threat Defense | |---|---|---| | Pricing model | Commercial | Commercial | | Category | Anti-Phishing | Anti-Phishing | | Verified | No | No | | Deployment type | Cloud | Cloud | | Company size fit | Startup, SMB, Mid-Market, Enterprise | SMB, Mid-Market, Enterprise | | Company | GreatHorn | KnowBe4 | | Headquarters | – | – | ### Use cases and capabilities | | GreatHorn Mailbox Intelligence | KnowBe4 DefendTM Advanced Inbound Email Threat Defense | |---|---|---| | Microsoft 365 | Yes | – | | Ransomware Prevention | – | Yes | ### Core features **GreatHorn Mailbox Intelligence** 10 features listed. Sign in on the page to see them. **KnowBe4 DefendTM Advanced Inbound Email Threat Defense** 10 features listed. Sign in on the page to see them. ### Integrations **GreatHorn Mailbox Intelligence** 2 integrations listed. Sign in on the page to see them. **KnowBe4 DefendTM Advanced Inbound Email Threat Defense** 3 integrations listed. Sign in on the page to see them. ## Which one fits you Based on what each listing shows: deployment, company size, price and open source. - [GreatHorn Mailbox Intelligence](https://cybersectools.com/tools/greathorn-mailbox-intelligence) fits if you are a startup. ## GreatHorn Mailbox Intelligence vs KnowBe4 DefendTM Advanced Inbound Email Threat Defense FAQ Common questions when comparing GreatHorn Mailbox Intelligence vs KnowBe4 DefendTM Advanced Inbound Email Threat Defense for Anti-Phishing. ### What is the difference between GreatHorn Mailbox Intelligence and KnowBe4 DefendTM Advanced Inbound Email Threat Defense? **GreatHorn Mailbox Intelligence**: Email security tool empowering users to identify & report phishing threats, built by GreatHorn. **KnowBe4 DefendTM Advanced Inbound Email Threat Defense**: AI-powered email security detecting phishing attacks missed by traditional tools, built by KnowBe4. The table above shows where their features, integrations, deployment and company size fit differ. ### Who makes GreatHorn Mailbox Intelligence and KnowBe4 DefendTM Advanced Inbound Email Threat Defense? **GreatHorn Mailbox Intelligence** is made by GreatHorn. **KnowBe4 DefendTM Advanced Inbound Email Threat Defense** is made by KnowBe4. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit. ### Is GreatHorn Mailbox Intelligence a good alternative to KnowBe4 DefendTM Advanced Inbound Email Threat Defense? Often, yes. GreatHorn Mailbox Intelligence and KnowBe4 DefendTM Advanced Inbound Email Threat Defense are both Anti-Phishing products. Use the table above to see where features, deployment and company size fit differ. ## Related comparisons - [GreatHorn Mailbox Intelligence vs Egress Defend](https://cybersectools.com/compare/egress-defend-vs-greathorn-mailbox-intelligence) - [GreatHorn Mailbox Intelligence vs PhishingBox KillPhish](https://cybersectools.com/compare/greathorn-mailbox-intelligence-vs-phishingbox-killphish) - [GreatHorn Mailbox Intelligence vs IronVest InboxGuard](https://cybersectools.com/compare/greathorn-mailbox-intelligence-vs-ironvest-inboxguard) - [KnowBe4 DefendTM Advanced Inbound Email Threat Defense vs Egress Defend](https://cybersectools.com/compare/egress-defend-vs-knowbe4-defendtm-advanced-inbound-email-threat-defense) - [KnowBe4 DefendTM Advanced Inbound Email Threat Defense vs PhishingBox KillPhish](https://cybersectools.com/compare/knowbe4-defendtm-advanced-inbound-email-threat-defense-vs-phishingbox-killphish) - [KnowBe4 DefendTM Advanced Inbound Email Threat Defense vs IronVest InboxGuard](https://cybersectools.com/compare/ironvest-inboxguard-vs-knowbe4-defendtm-advanced-inbound-email-threat-defense) ## Alternatives to each - [See all GreatHorn Mailbox Intelligence alternatives](https://cybersectools.com/alternatives/greathorn-mailbox-intelligence) - [See all KnowBe4 DefendTM Advanced Inbound Email Threat Defense alternatives](https://cybersectools.com/alternatives/knowbe4-defendtm-advanced-inbound-email-threat-defense) --- Source: https://cybersectools.com/compare/greathorn-mailbox-intelligence-vs-knowbe4-defendtm-advanced-inbound-email-threat-defense For AI agents: each product above has its own Markdown page (add .md to its URL, for example https://cybersectools.com/tools/greathorn-mailbox-intelligence.md). Every CybersecTools shortlist is listed at https://cybersectools.com/shortlists.md. More on GreatHorn Mailbox Intelligence and KnowBe4 DefendTM Advanced Inbound Email Threat Defense: funding, momentum, hiring and news, plus the full product and company record, are available through the Mandos MCP Server (paid plans), which connects to AI assistants: https://mandos.io/mcp?utm_source=cybersectools.com&utm_medium=compare-md