SENDIT is a self-hosted cold-email and email-marketing platform that owns its entire sending stack. Instead of renting SendGrid or Mailgun, it programmatically provisions its own domains and mailboxes (Mailcow), sends through its own MTA (Postal) and dedicated /24 IP pools, and runs automated IP/mailbox warmup, reply detection, and deliverability monitoring end-to-end. Multi-tenant SaaS with a Next.js dashboard, a public sending API, billing, analytics, and full GDPR/compliance built in.