A business's email campaigns, sending addresses and emailable audience (emails:read).

Without sender_id: the campaign view, the same one the dashboard campaign page shows: senders with their setup readiness, recent campaigns (or the one named by campaign_id) with status, the revision fingerprint the owner approves, outcome counts, and the audience that can be emailed (recorded consent, not on the do-not-email list). With sender_id: the DNS records that sending domain needs. Any member of the business can read. 503 email_campaigns_unavailable when the review cannot be built right now.