List senders

Returns senders, newest first. A namespace-scoped key lists only its namespace's senders; an organization-wide caller lists every sender, or one namespace's with namespaceId. Optionally filtered by verification status, active state, or default flag. Pass nextCursor back as cursor for the next page; it is null on the last page. Each row carries deliverability (bounce and complaint rates over the last 24 hours) and series, the last 14 days of daily email sends from the address, oldest first.