Vote for MXtreme Mail Firewall Appliance
MXtreme is an appliance that mitigates the risk of having your email servers directly exposed to the Internet. It is a Common Criteria EAL4+ certified email firewall that offers “Stateful Failover” with “Queue Replication”. Key features: Anti-Spam, Anti-Virus, Regulatory Compliance & Content Filtering, Anti-Fraud, Secure OWA and True High Availability.