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The Gmail API is subject to a daily usage limit, that applies to all requests
made from your application, and per-user rate limits. Each limit is identified
in terms of quota units, or an abstract unit of measurement representing
Gmail resource usage. The following table details the main request limits:
API limit type
Per user rate limit
250 quota units per user per second, moving average (allows short bursts).
Per-method quota usage
The number of quota units consumed by a request varies depending on the method
called. The following table outlines the per-method quota unit usage: