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Spam Filtering for Mail Exchangers:
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Chapter 1. Background

Table of Contents

1.1. Why Filter Mail During the SMTP Transaction?

1.1.1. Status Quo
1.1.2. The Cause
1.1.3. The Solution

1.2. The Good, The Bad, The Ugly

1.3. The SMTP Transaction

Here we cover the advantages of filtering mail during an incoming SMTP transaction, rather than following the more conventional approach of offloading this task to the mail routing and delivery stage. We also provide a brief introduction to the SMTP transaction.

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Organization of this document		Why Filter Mail During the SMTP Transaction?