Egress Prevent vs Messageware AttachView: Side-by-Side Comparison (2026)

Egress Prevent: Outbound email DLP that prevents accidental & malicious data loss via email. built by Egress. Core capabilities include Misdirected email detection using relationship mapping, Mis-attached file detection with contextual ML, Data exfiltration detection and blocking..

Messageware AttachView: OWA add-on that converts email attachments into secure HTML pages. built by Messageware. Core capabilities include Converts attachments to secure HTML pages, preventing local file storage or browser caching, Supports over 400 file formats without requiring local application installation, Granular admin controls for open, view, save, copy, and print permissions per user/group/IP/device..

Both serve the Email DLP market but differ in approach, feature depth, and target audience.

Egress Prevent differentiates with Misdirected email detection using relationship mapping, Mis-attached file detection with contextual ML, Data exfiltration detection and blocking. Messageware AttachView differentiates with Converts attachments to secure HTML pages, preventing local file storage or browser caching, Supports over 400 file formats without requiring local application installation, Granular admin controls for open, view, save, copy, and print permissions per user/group/IP/device.

Egress Prevent is developed by Egress. Messageware AttachView is developed by Messageware. Vendor maturity, funding stage, and team size can be important factors when evaluating long-term viability and support quality.

Egress Prevent integrates with Microsoft Outlook, Microsoft Office 365, Microsoft Azure Information Protection, Microsoft Purview, Outlook Web Access and 4 more. Messageware AttachView integrates with Microsoft Exchange Server, Outlook Web Access (OWA), ISA Server, SSL VPN, RSA and 1 more. Check integration compatibility with your existing security stack before deciding.

Egress Prevent and Messageware AttachView serve similar Email DLP use cases: both are Email DLP tools, both cover Microsoft 365. Review the feature comparison above to determine which fits your requirements.