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Ark

](/products/ark-2026-01-18/reviews)

(1)4.5/5

Ark is a white-label email infrastructure API designed for SaaS platforms that send email on behalf of their customers. It provides the backend layer that enables platform customers to send authenticated transactional email from their own domains — with proper DKIM, SPF, and DMARC configuration — without requiring the platform's engineering team to build and maintain email delivery infrastructure. Ark's core architecture is purpose-built for multi-tenant use cases. The data model follows a Platform → Tenant → Domain → Email hierarchy, where each tenant (the platform's customer) gets dedicated domain authentication, scoped API credentials, and per-tenant analytics. Key capabilities include: - Guided domain onboarding that auto-detects DNS providers (Cloudflare, Route 53, GoDaddy, Vercel, Namecheap, and others) and walks non-technical users through DKIM, SPF, and return path record setup with clear, actionable error messages - Per-tenant domain management with dedicated authentication, domain-level deliverability analytics, and scoped API keys - REST API and SMTP relay with official SDKs for Python, Node.js, Ruby, and Go, plus batch sending of up to 100 emails per request - Webhook event delivery with RSA-SHA256 signature verification for tracking opens, clicks, bounces, complaints, and delivery events - MCP server integration with 26 tools that allow AI coding assistants to manage email infrastructure directly from the development environment Ark is used by SaaS companies across CRM, helpdesk, invoicing, scheduling, and e-commerce verticals — anywhere a platform needs its customers to send branded, authenticated email. Typical buyers are engineering leads and technical founders at Seed-to-Series B companies with 2–15 engineers who need multi-tenant email capabilities but cannot justify the 2–4 engineering sprints required to build equivalent infrastructure in-house. Pricing starts at $29/month for 10 domains and 50,000 emails, with tiers scaling to 1,000 domains and 2 million emails per month. All plans include a 7-day free trial without requiring a credit card.

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