Warmup Inbox helps sales teams, agencies, recruiters, and founders improve cold email deliverability by creating realistic inbox engagement across connected mailboxes. The product monitors sender reputation, warms domains and inboxes, and supports teams that need outbound campaigns to land outside spam folders. The program describes a 25% recurring payout on referred subscriptions, a dashboard for referral tracking, marketing resources, and signup access. This fits email deliverability, outbound sales, and lead generation audiences without being a customer-only referral offer.