Best Mimecast Secure Email Gateway Alternatives in 2026
The top Mimecast Secure Email Gateway alternatives are Sublime Security, Sophos Email and Cloudflare Email Security: 15 email security gateways our editors would look at instead of Mimecast Secure Email Gateway, in our ranking order.
Mimecast Secure Email Gateway: A broad email security gateway for organizations needing layered protection and policy control. Where it falls short: pricing requires contact with sales.
Switching from Mimecast Secure Email Gateway? For most email security gateways buyers the best Mimecast Secure Email Gateway alternative is Sublime Security, built for teams wanting strong value and customization.
Why People Look for a Mimecast Secure Email Gateway Alternative
- Pricing requires contact with sales
- No free plan is offered
- Its broad control set may exceed simpler email-security needs
- No free plan — 1 of the alternatives below has it
Quick Picks by What You Need
- Best overallSublime Security9.4
Teams wanting strong value and customization
Visit Sublime Security - Best free optionSublime Security9.4
Has a free plan (Mimecast Secure Email Gateway has none)
Visit Sublime Security
All 15 Mimecast Secure Email Gateway Alternatives, Ranked
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
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Best forTeams wanting strong value and customization
- Better than Mimecast Secure Email Gateway:
- Free plan
- Editor score 9.4 vs 8.7
A customizable email security platform with unusually broad protection in its free Core plan.
- Malware sandboxing
- Impersonation protection
- Google Workspace support
9.4/10★★★★★Try Sublime Security -
Best forMicrosoft 365 and Google Workspace security
- Better than Mimecast Secure Email Gateway:
- Editor score 9.2 vs 8.7
A broad cloud gateway for Microsoft 365 and Google Workspace email protection.
- Malware sandboxing
- Impersonation protection
- Google Workspace support
9.2/10★★★★★Visit Sophos Email -
Best forFlexible cloud and hybrid deployments
- Better than Mimecast Secure Email Gateway:
- Editor score 9.0 vs 8.7
A flexible email gateway for organizations needing layered inbound and outbound protection.
- Malware sandboxing
- Impersonation protection
- Google Workspace support
9.0/10★★★★☆Visit Cloudflare -
Best forBehavioral AI threat detection
- Better than Mimecast Secure Email Gateway:
- Editor score 8.9 vs 8.7
Behavioral AI protection across email, collaboration tools, and connected security systems.
- Malware sandboxing
- Impersonation protection
- Google Workspace support
8.9/10★★★★☆Visit Darktrace -
Best forOrganizations needing layered email defenses
- Better than Mimecast Secure Email Gateway:
- Editor score 8.8 vs 8.7
Layered protection for email, collaboration apps, account takeover, and data loss.
- Malware sandboxing
- Impersonation protection
- Google Workspace support
8.8/10★★★★☆Visit Check Point -
Best forHybrid deployments with advanced analysis
A broad email gateway for organizations needing advanced inbound and outbound threat analysis.
- Malware sandboxing
- Impersonation protection
- Google Workspace support
8.6/10★★★★☆Visit Libraesva -
Best forBehavioral BEC and vendor-fraud defense
A focused cloud gateway for BEC, phishing, vendor fraud, and outbound DLP.
- Impersonation protection
- Google Workspace support
- Microsoft 365 support
8.5/10★★★★☆Visit Abnormal AI -
Best forUser-aware phishing and impersonation defense
A broad, user-aware email security platform with quote-based pricing.
- Impersonation protection
- Google Workspace support
- Microsoft 365 support
8.4/10★★★★☆Visit INKY -
Best forMicrosoft 365 protection suites
A broad Microsoft 365 protection suite with layered email security and data recovery.
- Malware sandboxing
- Impersonation protection
- Microsoft 365 support
Pricing on request · 14-day trial Our Hornetsecurity 365 Total Protection verdict → Visit Hornetsecurity8.3/10★★★★☆Visit Hornetsecurity -
Best forFortinet-centered security environments
A broad email security platform suited to Fortinet-centered hybrid environments.
- Malware sandboxing
- Impersonation protection
- Google Workspace support
8.2/10★★★★☆Visit Fortinet -
Best forManaged protection with incident response
Layered cloud email protection for Microsoft 365, Google Workspace, and other mail services.
- Impersonation protection
- Google Workspace support
- Microsoft 365 support
8.1/10★★★★☆Visit Fortinet -
Best forPhishing-focused protection with automation
A phishing-focused gateway for Microsoft 365 and Google Workspace environments.
- Malware sandboxing
- Impersonation protection
- Google Workspace support
8.0/10★★★★☆Visit IRONSCALES -
Best forStraightforward cloud or hybrid filtering
A broad email security gateway for organizations needing inbound and outbound control.
- Malware sandboxing
- Impersonation protection
- Google Workspace support
7.9/10★★★★☆Visit LevelBlue -
Best forAppliance-style content inspection
A broad inspection and governance gateway for organizations securing inbound and outbound email.
- Malware sandboxing
- Google Workspace support
- Microsoft 365 support
7.8/10★★★★☆Visit Fortra -
Best forCloud email teams needing established filtering
Broad inbound and outbound protection for Microsoft 365, Google Workspace, and Exchange.
- Malware sandboxing
- Impersonation protection
- Google Workspace support
7.7/10★★★★☆Visit Broadcom
Mimecast Secure Email Gateway Alternatives: Common Questions
What is the best alternative to Mimecast Secure Email Gateway?
Sublime Security: #1 in our Email Security Gateways ranking, with an editor score of 9.4 out of 10. A customizable email security platform with unusually broad protection in its free Core plan.
Is there a free alternative to Mimecast Secure Email Gateway?
Yes. Sublime Security has a free plan or a free tier.
Why do people look for Mimecast Secure Email Gateway alternatives?
Pricing requires contact with sales; No free plan is offered; Its broad control set may exceed simpler email-security needs.
How do I switch from Mimecast Secure Email Gateway?
Export your data from Mimecast Secure Email Gateway (most tools have an export in their settings). Sign up for the alternative; start on its free plan or trial if it has one. Import your export and set up the integrations your team relies on. Run both side by side for a short while, then cancel Mimecast Secure Email Gateway.
How to Switch from Mimecast Secure Email Gateway
- Export your data from Mimecast Secure Email Gateway (most tools have an export in their settings).
- Sign up for the alternative; start on its free plan or trial if it has one.
- Import your export and set up the integrations your team relies on.
- Run both side by side for a short while, then cancel Mimecast Secure Email Gateway.
Mimecast Secure Email Gateway vs Each Alternative
| # | Tool | Free plan | Paid from | Outbound filtering | Impersonation protection | Malware sandboxing | Deployment model | Score |
|---|---|---|---|---|---|---|---|---|
| 6 | Mimecast Secure Email Gateway | No | Yes | Yes | Yes | Cloud | 8.7 | |
| 1 | Sublime Security | Yes | Yes | Yes | Yes | Hybrid | 9.4 | |
| 2 | Sophos Email | No | Yes | Yes | Yes | Cloud | 9.2 | |
| 3 | Cloudflare Email Security | No | Yes | Yes | Yes | Hybrid | 9.0 | |
| 4 | Darktrace / EMAIL | No | Yes | Yes | Yes | Cloud | 8.9 | |
| 5 | Check Point Email Security | No | Yes | Yes | Yes | Hybrid | 8.8 | |
| 6 | Libraesva Email Security | No | Yes | Yes | Yes | Hybrid | 8.6 | |
| 7 | Abnormal Email Security | Yes | Yes | Cloud | 8.5 | |||
| 8 | INKY Email Security | Yes | Yes | Cloud | 8.4 | |||
| 9 | Hornetsecurity 365 Total Protection | No | Yes | Yes | Yes | Hybrid | 8.3 | |
| 10 | FortiMail Email Security | Yes | Yes | Yes | Hybrid | 8.2 | ||
| 11 | Perception Point Advanced Email Security | Yes | Yes | Cloud | 8.1 | |||
| 12 | IRONSCALES Email Protect | No | No | Yes | Yes | Cloud | 8.0 | |
| 13 | Trustwave Secure Email Gateway | Yes | Yes | Yes | 7.9 | |||
| 14 | Fortra Secure Email Gateway | Yes | Yes | Appliance | 7.8 | |||
| 15 | Symantec Email Security.cloud | Yes | Yes | Yes | Cloud | 7.7 |
Head-to-Head
- Mimecast Secure Email Gateway vs Sublime Security
- Mimecast Secure Email Gateway vs Sophos Email
- Mimecast Secure Email Gateway vs Cloudflare Email Security
- Mimecast Secure Email Gateway vs Darktrace / EMAIL
- Mimecast Secure Email Gateway vs Check Point Email Security
- Mimecast Secure Email Gateway vs Libraesva Email Security
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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