Head-to-head · Cloud Email Security
Mimecast Email Security vs OpenText Core Email Threat Protection
Mimecast Email Security leads on 0 checks, OpenText Core Email Threat Protection on 0, and 2 are even. Who comes out ahead on the 2 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.
Our verdict
- Highest scoreMimecast Email Security · 9.3/10
- Free trialonly Mimecast Email Security
- Most featuresOpenText Core Email Threat Protection · 1 of 2
Mimecast Email Security scores higher on our rubric for cloud email security: 9.3 against 8.6 out of 10; our editors rank them #1 and #8.
Mimecast Email Security is the better fit for organizations needing broad integrations. OpenText Core Email Threat Protection is the better fit for microsoft 365-focused email security.
- Mimecast Email Security fits best
Organizations needing broad integrations
- OpenText Core Email Threat Protection fits best
Microsoft 365-focused email security
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Side by side
| Feature | Mimecast Email Security 9.3/10 Visit ↗ | OpenText Core Email Threat Protection 8.6/10 Visit ↗ |
|---|---|---|
| At a glance | ||
| Editor score | 9.3 | 8.6 |
| Ranking | #1 in Cloud Email Security | #8 in Cloud Email Security |
| Best for | Organizations needing broad integrations | Microsoft 365-focused email security |
| Pricing model | Paid | Paid |
| Starting price | — | Pricing on request |
| Free plan | — | Not checked yet |
| Free trial | 30 days | — |
| Deployment | Cloud | Cloud |
| Platforms | Web | Web |
| Support | Docs, Community | Tickets · 24/7 |
| Integrations | 300+ integrations | 2 integrations |
| Built for | Small business, Mid-market, Enterprise | Solo, Small business, Mid-market, Enterprise |
| Features Mimecast Email Security 0/2 · OpenText Core Email Threat Protection 1/2 | ||
| Post-delivery remediation | Not checked yet | ✓ (best) |
| Data loss prevention | Not checked yet | Not checked yet |
| Specs | ||
| Deployment model | Not checked yet | Gateway |
| Threat detection | Not checked yet | phishing, ransomware, zero-day malware, viruses, impersonation, business email compromise, spoofing, spam |
| Email platforms | Not checked yet | Microsoft 365 |
| Maximum users | Not checked yet | Not checked yet |
| Our review | ||
| Pros |
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| Cons |
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| Our verdict | Mimecast Email Security protects Microsoft 365, Google Workspace, on-premises, and hybrid email environments. It targets small, mid-market, and enterprise organizations that need centralized controls for phishing, business email… Read the review → |
OpenText Core Email Threat Protection is a cloud-deployed gateway service for businesses of all sizes, including MSPs and VARs, that use Microsoft 365. It filters inbound, outbound and internal email, detecting phishing, ransomware,… Read the review → |
Strengths and trade-offs
Mimecast Email Security — where it wins
- AI phishing, BEC, anomaly detection, and malicious-URL protection
- MX gateway and API deployment across major email environments
- 300 integrations plus continuity, sandboxing, and compliance certifications
Where it doesn't
- Pricing requires contacting sales
- Cloud deployment may not fit on-premises security requirements
- No perpetual free plan; trial lasts 30 days
OpenText Core Email Threat Protection — where it wins
- Filters inbound, outbound and internal messages with multilayer threat detection
- Click-time link scanning plus attachment disarming and sandbox analysis
- Retracts delivered Microsoft 365 messages and protects against impersonation
Where it doesn't
- Subscription pricing requires contacting OpenText or a partner
- Email platform coverage centers on Microsoft 365
- Support is provided through tickets, even with 24/7 availability
- Mimecast Email Security9.3/10 · Pricing on request · 30-day trial
Broad email protection with gateway, API, continuity, and 300 integrations.
Visit MimecastFull verdict → - OpenText Core Email Threat Protection8.6/10 · Pricing on request
A Microsoft 365-focused gateway combining filtering, remediation and centralized oversight.
Visit OpenTextFull verdict →
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- Sophos Email vs OpenText Core Email Threat Protection
- Darktrace / EMAIL vs OpenText Core Email Threat Protection
- Check Point Email Security vs OpenText Core Email Threat Protection
All cloud email security comparisons → · Full ranking →
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Last updated · How we research and update