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Inboxes are currently in private beta and only available to a limited number of users. The response shape might change before GA.Get early access if you’re interested in testing this feature.Once you have access, upgrade your Resend SDK to use the new methods:
Event triggered whenever an outbound email is accepted for delivery and added to a thread. Note: source is always system, because the email pipeline sends this event, even when the API or an agent sent the email. Note: When the email comes from a draft, inbox.draft.sent fires first, from the send call. This event follows once the email is accepted for delivery.