3.1.1 Abstract Data Model

This section describes a conceptual model of possible data organization that an implementation maintains to participate in this protocol. The described organization is provided to facilitate the explanation of how the protocol behaves. This document does not mandate that implementations adhere to this model as long as their external behavior is consistent with that described in this document.

The client maintains the following state for a given connection to an SMTP server:

Username: The username provided by the application or higher-layer protocol.

Password: The password provided by the application or higher-layer protocol.

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