Chapter 3. ESA Email Pipeline

In this chapter, you will learn the following:

• The full email-processing pipeline for all accepted messages

• How the system performs connection handling and rate limiting

• Operations performed in the ESA work queue

• How to configure options for acceptance and delivery of messages

Simple Mail Transfer Protocol (SMTP) connections and email messages handled by the Email Security Appliance (ESA) move from connection acceptance to SMTP conversation, to message acceptance, and then to filtering and delivery in a step-by-step process known as the email security pipeline. The pipeline is important because the fixed order of certain steps dictates configuration and architecture, and the flexibility of other steps means ...

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