Grokking the System Design Interview, Volume II
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Step 2: Requirements

Users forgive a slow inbox for a moment, but they do not forgive a message that was accepted and then disappeared. That single promise shapes most of the requirements below. Functional requirements describe what the service must do, and non-functional requirements describe how well it must do it.

Functional requirements

  1. Sending and receiving. Users send and receive mail from web, mobile, and desktop clients

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