This article is the first of a three-part series that will help systems administrators to implement the first two methods to filter out unwanted e-mails before they arrive in the end-user's in-box. Server configurations are more powerful and can filter for all users on the system at once, while e-mail client configurations can only protect an individual's right to spam-free e-mail. As systems administrators, most SecurityFocus readers will prefer that the unwanted e-mail doesn't even reach the client at all. Although mail filtering is an option for many STMP servers and delivery agents, this series will only focus on two: Postfix and Procmail, respectively.
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