From Spamfighter:
SPAMfighter Mail Gateway application does not require any special hardware and integrates perfectly with the company's existing e-mail infrastructure to secure the company e-mail environment. SPAMfighter Mail Gateway's multilayered defense system will secure you against all e-mail attacks using spyware, virus, phishing and spam. It is easy to install and use with no daily maintenance tasks needed. SPAMfighter Mail Gateway is based on SPAMfighter's unique world-wide community with over 6 million users.
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