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Postfix is a mail transport agent written by security researcher Wietse Venema. Not surprisingly, Postfix is designed from the ground up to be a highly secure system. It consists of several components , each of which runs with least privilege and none of which trust data from the other without validating it themselves . Despite the extensive security emphasis in the system's architecture, Postfix is capable of very good performance in normal conditions; because of architectural decisions, it is also fault tolerant and capable of good performance under adverse conditions such as resource starvation . It has become a popular replacement for sendmail because it provides a compatible command-line interface. This chapter explains how to integrate SpamAssassin into a Postfix-based mail server to perform spam-checking for local recipients or to create a spam-checking mail gateway.
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