eWall SMTP Proxy - Version 4.0 eWall is a Microsoft Windows based gateway between the Internet and your mail server. It monitors the SMTP traffic in real-time, catching the majority of spam and viruses. The chain of flexible filters stops more than 95% of unwanted emails out of the box (more than 99% with Message Sniffer), dropping the mail server load by more than 90%. eWall doesn't require maintenance and includes optional self-updating components (ClamAV, Message Sniffer), that seamlessly work with and protect your mail environment from spam and viruses 24 hours a day, 7 days a week.eWall is built on top of time-proven and reliable technologies. PHP is used as a flexible and powerful scripting engine, allowing you to write filters of any complexity. Any standard PHP drivers or libraries can be used in eWall's event-driven environment. The powerful PostgreSQL database is used to keep the statistics and index quarantined messages, emails and IP-lists, and track the session history. XML-RPC transport is used to manage and watch the eWall