Free surgewall software for linux

SurgeMail is the fastest, most robust and secure, full-featured email server on the market today supporting all the protocols and standards. Surgewall works with every mail server and can be installed in minutes, instantly gives you the uniquely advanced, Spam Blocking, Virus Scanning and even user configurable filtering and friends modes normally only found in our SurgeMail product.
Main features:
- User existence is checked at rcpt stage to prevent major spam problems
- Spam and virus free email
- Friends mail screening system.
- Integrated mail server and web based email
- Web based administration (user, domain and server)
- Full SSL secure support for all protocols
- Runs on platform of choice (Windows, most Unix versions)
- Installs in minutes and unparalleled after sales service