Hornetsecurity - Hornetsecurity offers you comprehensive, integrated managed e-mail security services.

Vade for Microsoft 365 - Vade for Microsoft 365 is a top-notch email security solution that is specifically aimed to help MSPs protect their networks from adversaries.

Mimecast Gateway - Mimecast Gateway is a SaaS-based email security solution that uses sophisticated, multi-layered detection engines and intelligence to protect email data and employees from malware, spam, advanced threats and zero-day attacks.

Libraesva Email Security Gateway - Libraesva Email Security Gateway provides enterprise email protection to assist small to large-sized businesses and enterprises to prevent outside attacks on their network.

dmarcian - Safeguard your email from abuse

Websense Email Security - Websense Email Security is a powerful email protection tool that helps you strengthen the security of your network.