SMTP agent/content/support/library/data/v78/install/install_dss.pdf#page=73
        <h2>Data Security Installation Guide v7.8.x</h2>
        <h3>SMTP agent</h3>
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        <p>
        The Websense Data Security SMTP agent is installed on a Data Security server or on another Windows server equipped with Microsoft Internet Information Services (IIS) v6.
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        <p>It receives all outbound email from the mail server and forwards it to a Websense Data Security Policy Engine. The SMTP agent then receives the analyzed email back from the policy engine. Depending on the analysis, SMTP agent blocks the email or forwards it to the mail gateway. When installed on the Data Security Management server or supplemental Data Security server, the SMTP agent uses the local policy engine of those servers to analyze email, unless load balancing has been configured, in which case it uses the specified policy engine. The SMTP agent supports permit, block, and encrypt actions. </p>
        <p>Click <b>View Complete Document</b> for more. </p>