Grokking the System Design Interview, Volume II
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Step 3: Capacity Estimation

The throughput of this system is large, but its storage is what decides the architecture. The estimates below are rough, and each one points to a design decision.

User base. Assume about 1 billion registered users, close to Gmail's scale. About 500 million are daily active users (DAU), people who open their mail on a given day. Usage spreads across time zones, so tens of millions of users are online at any moment.

Email volume. Industry estimates put worldwide email traffic at more than 300 billion messages a day

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