domainId (CMR component domain ID) or domain (plain domain name) must be supplied — not both required, but at least one. The domain is always scoped to the resolved userId, so callers cannot retrieve admin mailboxes from another partner's domains.curl --location 'https://customers.coldmailreseller.com/api/v1/integration/mailboxes/admin-mailbox-details?userId=H8M9JV2S9HMPYFQW393AZHQVD4XM&domainId=dom_V2M9KP3XAQZL&domain=acmecorp.com' \
--header 'cmr-x-api-key: <api-key>'{
"status": 200,
"message": "Admin mailbox fetched successfully",
"data": null
}