check this one one out:
602Pro LAN Suite 2003 (FREE)
This is a secure mail server with antivirus and antispam, and a built-in firewall and proxy for controlled Internet sharing. The standards-based SSL SMTP/POP3 e-mail server provides secure encrypted communication. Antispam is provided by DNSbl service and a blacklist. It includes a Web mail client with WAP support. An integrated fax server provides unified access to faxes and e-mail. Secure your network with the built-in packet filter, and use the HTTP and SOCKS proxy with cache for Internet sharing. Manage IP addresses with the included DHCP server. The integrated Web server provides access to the Web mail client, remote administration, and user home pages. SSL, ISAPI, CGI, and FastCGI support is available.
New enhancements in version 2003 are a firewall with logging, support for Windows Server 2003, built-in BitDefender Antivirus, and separate IP filters configurable for the proxy, SMTP, WWW, and remote administration services.
Leopold