It is still a beta version! This is a simple service - Email Gateway.
Free Email Gateway enables organizations to secure their email and productivity infrastructure with effective and accurate real-time antispam and antimalware protection, targeted attack protection, advanced content filtering.Getting started
Free Email Gateway - perfect solution for small business (Microsoft™ Exchange Servers and other email solution)
Anti-spam gateway blocks more than 99.9% of spam with less than one in 1 million false positives and real-time automatic updates.
Antispam filtering engine powered by mysecuremail.net - a set of technologies that identify email borne threats based on reputation on both the global and local level.