The email API built for platforms like yours

Every SaaS platform that sends email on behalf of its customers hits the same wall. You need per-customer domain isolation, automated SPF/DKIM/DMARC setup, bounce handling that doesn't affect your other tenants, and deliverability monitoring across hundreds of sending domains. Existing email APIs were never built for this.

After 12 years of working with email infrastructure at scale — from startups to unicorns — we lived this problem firsthand. Teams spend months stitching together workarounds on top of providers like SendGrid or Amazon SES, building multi-tenant logic that should be part of the email layer itself.

So we built Ark from scratch as a white label email API. Multi-tenant by default. Every customer gets their own sending domain, their own reputation, their own analytics. One integration for your platform, full isolation underneath.

No legacy code, no workarounds, no bolted-on multi-tenant features. Just the email infrastructure that platforms actually need. Read our technical guide on sending from customer domains to see how the architecture works.