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PATCH
Set a static daily cap on one custom domain. The ceiling never auto-adjusts — only this endpoint (or the console) changes it.

Body

integer | null
required
Emails this domain may send per UTC day, 1–1,000,000. null removes the ceiling (plan and workspace caps still apply).
todayUsed and resetsAt are always returned so you can warn before the ceiling bites. When the new ceiling is already exhausted today, note explains that sends pause until the reset:
Sends past the ceiling fail with 429 domain_daily_cap_reached (with Retry-After, X-Domain-Limit, and X-Domain-Used headers) — see Errors and Deliverability.