What are some alternatives?
EuropeanMX - Protects your company by blocking spam and virus before they reach your network.
Symantec Web Security.cloud - Symantec Web Security is a cloud based software that helps protect organization from compromised websites and malicious downloads.
Hornetsecurity - Hornetsecurity offers you comprehensive, integrated managed e-mail security services.
SpamTitan - SpamTitan is an anti-spam email solution specifically developed to meet the demands of modern business. Delivering a spam detection rate over 99.9%
Alert Logic Threat Manager - Alert Logic Threat Manager is a cloud-based managed intrusion detection and vulnerability assessment solution.