Chapter 6. Controlling Spam

Introduction

Recipe  6.1.   Blocking Spam with the access Database

Recipe  6.2.   Preventing Local Users from Replying to Spammers

Recipe  6.3.   Reading the access Database via LDAP

Recipe  6.4.   Using a DNS Blackhole List Service

Recipe  6.5.   Building Your Own DNS Blackhole List

Recipe  6.6.   Whitelisting Blacklisted Sites

Recipe  6.7.   Filtering Local Mail with procmail

Recipe  6.8.   Filtering Outbound Mail with procmail

Recipe  6.9.   Invoking Special Header Processing

Recipe  6.10.   Using Regular Expressions in sendmail

Recipe  6.11.   Identifying Local Problem Users

Recipe  6.12.   Using MILTER

Recipe  6.13.   Bypassing Spam Checks

Recipe  6.14.   Enabling Spam Checks on a Per-User Basis