Best Proxmox Mail Gateway Alternatives in 2026
The top Proxmox Mail Gateway alternatives are Sublime Security, Sophos Email and Cloudflare Email Security: 15 email security gateways our editors would look at instead of Proxmox Mail Gateway, in our ranking order.
Proxmox Mail Gateway: A focused self-hosted gateway with broad filtering controls and predictable per-host pricing. Where it falls short: requires self-hosted deployment between the firewall and mail server.
Switching from Proxmox Mail Gateway? For most email security gateways buyers the best Proxmox Mail Gateway alternative is Sublime Security, built for teams wanting strong value and customization.
Why People Look for a Proxmox Mail Gateway Alternative
- Requires self-hosted deployment between the firewall and mail server
- Annual subscriptions are priced per host rather than per user
- Support response times and ticket allowances vary by plan
- 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 (Proxmox Mail Gateway has none)
Visit Sublime Security
All 15 Proxmox Mail 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.
-
Best forTeams wanting strong value and customization
- Better than Proxmox Mail Gateway:
- Free plan
- Editor score 9.4 vs 7.2
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 Proxmox Mail Gateway:
- Editor score 9.2 vs 7.2
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 Proxmox Mail Gateway:
- Editor score 9.0 vs 7.2
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 Proxmox Mail Gateway:
- Editor score 8.9 vs 7.2
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 Proxmox Mail Gateway:
- Editor score 8.8 vs 7.2
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 forMature all-around email protection
- Better than Proxmox Mail Gateway:
- Editor score 8.7 vs 7.2
A broad email security gateway for organizations needing layered protection and policy control.
- Malware sandboxing
- Impersonation protection
- Google Workspace support
8.7/10★★★★☆Visit Mimecast -
Best forHybrid deployments with advanced analysis
- Better than Proxmox Mail Gateway:
- Editor score 8.6 vs 7.2
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
- Better than Proxmox Mail Gateway:
- Editor score 8.5 vs 7.2
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
- Better than Proxmox Mail Gateway:
- Editor score 8.4 vs 7.2
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
- Better than Proxmox Mail Gateway:
- Editor score 8.3 vs 7.2
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
- Better than Proxmox Mail Gateway:
- Editor score 8.2 vs 7.2
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
- Better than Proxmox Mail Gateway:
- Editor score 8.1 vs 7.2
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
- Better than Proxmox Mail Gateway:
- Editor score 8.0 vs 7.2
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
- Better than Proxmox Mail Gateway:
- Editor score 7.9 vs 7.2
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
- Better than Proxmox Mail Gateway:
- Editor score 7.8 vs 7.2
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
Proxmox Mail Gateway Alternatives: Common Questions
What is the best alternative to Proxmox Mail 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 Proxmox Mail Gateway?
Yes. Sublime Security has a free plan or a free tier.
Why do people look for Proxmox Mail Gateway alternatives?
Requires self-hosted deployment between the firewall and mail server; Annual subscriptions are priced per host rather than per user; Support response times and ticket allowances vary by plan.
How do I switch from Proxmox Mail Gateway?
Export your data from Proxmox Mail 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 Proxmox Mail Gateway.
How to Switch from Proxmox Mail Gateway
- Export your data from Proxmox Mail 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 Proxmox Mail Gateway.
Proxmox Mail Gateway vs Each Alternative
| # | Tool | Free plan | Paid from | Outbound filtering | Impersonation protection | Malware sandboxing | Deployment model | Score |
|---|---|---|---|---|---|---|---|---|
| 21 | Proxmox Mail Gateway | No | €190/yr | Yes | Gateway | 7.2 | ||
| 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 | Mimecast Secure Email Gateway | No | Yes | Yes | Yes | Cloud | 8.7 | |
| 7 | Libraesva Email Security | No | Yes | Yes | Yes | Hybrid | 8.6 | |
| 8 | Abnormal Email Security | Yes | Yes | Cloud | 8.5 | |||
| 9 | INKY Email Security | Yes | Yes | Cloud | 8.4 | |||
| 10 | Hornetsecurity 365 Total Protection | No | Yes | Yes | Yes | Hybrid | 8.3 | |
| 11 | FortiMail Email Security | Yes | Yes | Yes | Hybrid | 8.2 | ||
| 12 | Perception Point Advanced Email Security | Yes | Yes | Cloud | 8.1 | |||
| 13 | IRONSCALES Email Protect | No | No | Yes | Yes | Cloud | 8.0 | |
| 14 | Trustwave Secure Email Gateway | Yes | Yes | Yes | 7.9 | |||
| 15 | Fortra Secure Email Gateway | Yes | Yes | Appliance | 7.8 |
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Last updated · How we research and update