Spam Filtering for Mail Exchangers

• Index
• Introduction
• Purpose of this Document
• Audience
• New versions of this document
• Revision History
• Credits
• Feedback
• Translations
• Copyright information
• What do you need?
• Conventions used in this document
• Organization of this document
• Background
• Why Filter Mail During the SMTP Transaction?
• The Good, The Bad, The Ugly
• The SMTP Transaction
• Techniques
• SMTP Transaction Delays
• DNS Checks
• SMTP checks
• Greylisting
• Sender Authorization Schemes
• Message data checks
• Blocking Collateral Spam
• Considerations
• Multiple Incoming Mail Exchangers
• Blocking Access to Other SMTP Servers
• Forwarded Mail
• User Settings and Data
• Questions Answers
• Exim Implementation
• Prerequisites
• The Exim Configuration File
• Options and Settings
• Building the ACLs - First Pass
• Adding SMTP transaction delays
• Adding Greylisting Support
• Adding SPF Checks
• Adding MIME and Filetype Checks
• Adding Anti-Virus Software
• Adding SpamAssassin
• Adding Envelope Sender Signatures
• Accept Bounces Only for Real Users
• Exempting Forwarded Mail
• Final ACLs
• Glossary
• GNU General Public License
• Preamble
• TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
• How to Apply These Terms to Your New Programs