Fleet
Ember warms every mailbox
Sentinel watches bounces and complaints all day
Relay replaces anything that goes wrong
20ready
Your 10 domains
Two mailboxes on each. None of them is your real domain.Inbox placement tests
Each test sends one seed email per mailbox to real inboxes at Gmail, Outlook and Yahoo, then checks which folder it arrived in. Inbox is good. Promotions counts as delivered. Spam or missing pauses that mailbox until Ember has repaired it. Tests run weekly, and on any mailbox Sentinel is worried about.
Ring = mailboxes by state (ready / warming / paused / replacing). Gauges use the real thresholds from lib/email/sentinel.ts: BOUNCE_RATE_LIMIT 0.03, COMPLAINT_RATE_LIMIT 0.001. Domain rows are sending_domains + mailboxes; "Show how" opens the DNS and reputation detail that used to be the Infrastructure and Deliverability pages. The caught-domain card is the replacement flow: manual approve on Standard, automatic on Pro and Scale.