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Building from First Principles

Building an Email Relay System

The hard part of an email relay is not SMTP transport but preserving identity, thread, and authorization boundaries.

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Building an Email Relay System
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Overview

Design an email relay system from SMTP sessions, address tokens, and reply parsing.

This deep dive preserves the source terminology and conceptual sequence as a concise technical reference.

Source and scope

The document retains the source terminology, code links, and conceptual order.

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