Cisco Secure Email (formerly Email Security) Alternatives: Top 10 Secure Email Gateway Software in 2025

SonicWall Email Security is ideal for organizations that need a dedicated on-premises solution. SonicWall’s solution can be deployed as a hardened physical appliance, robust virtual appliance or software application. The multi-layered solution provides comprehensive inbound and outbound protection, and defends against advanced email-borne threats such as ransomware, zero-day threats, spear phishing and business email compromise (BEC).

Fast interception of any content-borne attack across all collaboration channels including email, cloud storage, CRM apps, and messaging platforms. We prevent phishing, BEC, spam, malware, Zero-days, and N-days well before they reach your end-users. Replace your complex existing security stack – including AVs, sandboxes, and CDRs – with one solution against APTs, phishing, malware, BEC, impersonation attacks, and spam. 7 layers of next-gen static and dynamic engines prevent malicious files, URLs, and social-engineering based techniques.

Clearswift offers the industry's most effective layer of real-time email inspection to detect and completely sanitize evasive threats. Advanced Threat Protection protects against zero-hour and malware evading AV scans. Anti-spam and Phishing: Prevent SPAM and phishing emails initiating an attack. Adaptive Data Loss Prevention (A-DLP) Protect critical information with industry's game-changing Adaptive DLP technology for email.

Trellix keeps data safe with enterprise-grade drive encryption, access control, and user behavior monitoring and is also available in two suits Some advanced features are data loss prevention, device control, full-disk encryption, and protection for cloud storage; renders the data unreadable if the device is lost or stolen. The encryption solution is FIPS 140-2 and common EAL2+ certified. It encrypts the removable media, file shares, and cloud data- enables you to control the specific file types and folders to encrypt or block. Also, you can encrypt files to cloud storage services such as Box, Dropbox, Microsoft OneDrive, and Google Drive.You can monitor and regulate how employees access, use, and transfer data via common channels, such as instant messages, email, printing, and USB drives—both in and away from the office.Also lets you monitor real-time events and generate detailed reports that show auditors and senior management compliance with internal and regulatory privacy requirements.Trellix has a simple security and policy management-it that establishes and enforces data protection policies while centralizing data security management.

Ultra-modern multi-layered email security for your entire organisation from known, unknown and emerging email security threats. Stop large-scale phishing, targeted attacks, CEO fraud and malware in their tracks with a comprehensive, cloud email security solution. Email Security incorporates multiple technologies to ensure enterprise class threat detection rates with very high accuracy - over and above what single engine solutions can provide.