Per-tenant email identities for multi-tenant SaaS via API

Per-tenant email identities for multi-tenant SaaS via API targets a $6.0B = 2,000,000 SaaS companies x $3,000 ACV. Assumes global pool of SaaS businesses that send transactional email, paying roughly $250/month for tenant identity and deliverability management. total addressable market with medium saturation and a year-over-year growth rate of 15%+ driven by increasing SaaS counts, API-first adoption, and stricter deliverability/authentication requirements.

Key trends driving demand: DMARC and deliverability enforcement -- major mailbox providers tighten policies, increasing need for correct DKIM/SPF/DMARC per sending identity, and driving demand for automated onboarding.; API-first infrastructure -- programmable DNS and email APIs enable one-call provisioning workflows, lowering integration friction for dev teams.; Rise of multi-tenant SaaS and per-customer branding -- customers expect their emails to reflect their brand and domain, so tenant-scoped identities are increasingly required.; Reputation segmentation -- isolating tenant sending reputations reduces blast radius from noisy or malicious tenants, creating operational value for segmented identities..