Trustwave Secure Email Gateway review
A broad email security gateway for organizations needing inbound and outbound control.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Trustwave Secure Email Gateway, currently marketed as LevelBlue MailMarshal, is an enterprise email security gateway for organizations that need protection across inbound and outbound email. It addresses spam, malware, phishing, spoofing, business email compromise, malicious URLs, and data leaks, while adding policy enforcement, quarantine management, reporting, attachment controls, and malware analysis sandboxing. Its deployment range makes it suitable for organizations operating cloud, hybrid, or on-premises environments, rather than teams seeking only a lightweight web-based filter.
The product's main strength is coverage across the email security workflow. Inbound and outbound filtering, anti-spam and anti-malware controls, impersonation protection, DLP, sensitive-information blocking, custom rules, and quarantine management allow administrators to combine threat prevention with policy enforcement. Attachment controls, URL analysis, and sandboxing add deeper inspection for potentially harmful content, while threat dashboards and reporting support ongoing oversight. These capabilities make it a fit for organizations that want one gateway to address both external threats and outbound data handling.
Platform fit is another practical consideration. Microsoft 365 and Google Workspace are supported, with Google Workspace support documented for the MailMarshal Cloud service, and the product can also be deployed in cloud, hybrid, or on-premises models. Pricing is handled through a sales process, so organizations should evaluate requirements and deployment scope before selecting it. Choose Trustwave Secure Email Gateway when layered filtering and flexible deployment matter more than a simple, self-serve purchase. Smaller teams with basic filtering needs may prefer a narrower tool with less administrative scope.
Trustwave Secure Email Gateway pros and cons
- Where it wins
- Covers spam, malware, phishing, spoofing, BEC, and malicious URLs
- Combines DLP, sandboxing, quarantine, policies, and reporting
- Supports Microsoft 365, Google Workspace, cloud, hybrid, and on-premises deployment
- Where it doesn't
- Pricing requires a sales conversation
- Deployment options may require more planning than cloud-only tools
- Its broad control set may exceed the needs of smaller teams
Trustwave Secure Email Gateway fact sheet, pricing and score →
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