Ark

Ark is the white-label email API purpose-built for modern SaaS platforms and multi-tenant applications. It is specifically designed for companies building products like CRMs, helpdesks, invoicing tools, or scheduling software that need to send email on behalf of their customers. Unlike traditional email services built for a single sender, Ark treats multi-tenancy as the default. It eliminates the immense complexity of managing hundreds of customer domains, SPF/DKIM/DMARC authentication, and per-tenant email logs. Developers integrate once and can then manage every customer domain from a single dashboard. Ark's core value is enabling teams to ship robust, white-labeled email functionality in minutes instead of spending weeks or months building and maintaining custom email infrastructure on top of generic APIs. It combines enterprise-grade deliverability with an intuitive, AI-native workflow, making it the essential tool for platforms that scale with their customer base.

Native Multi-Tenant Architecture

Ark is built from the ground up for platforms with multiple customers. Every tenant is automatically isolated with their own domains, sending logs, analytics, and debugging data. This eliminates the need to build complex tenant isolation layers on top of a single-sender email API, providing immediate clarity and control per customer directly out of the box.

AI-First Developer Workflow

Ark integrates seamlessly into the modern AI-powered development stack. It features AI-readable documentation that reduces token usage by 10x and a native MCP server with 26 tools. This allows AI coding assistants like Claude, Cursor, and Windsurf to generate production-ready code and manage email operations through natural language, dramatically speeding up integration and feature development.

Automated Domain & DNS Management

Onboarding new customer domains is simplified to a two-minute process. Ark automatically detects the customer's DNS provider (e.g., Cloudflare, GoDaddy, Route53) and provides them with exact, step-by-step instructions. For some providers, it can configure DNS records automatically, removing the need for support calls to explain technical details like TXT records.

White-Label Email Infrastructure

Ark provides a complete white-label solution where every email sent appears authentically from your customer's domain (e.g., [email protected]). It handles all underlying authentication (SPF, DKIM, DMARC) and delivers robust infrastructure with sub-second delivery times and 99.9% deliverability, making your platform feel like an integrated part of your customer's business.

CRM & Helpdesk Platforms

CRM and helpdesk software needs to send notifications, ticket updates, and alerts from each client's own domain to maintain brand consistency and trust. Ark enables these platforms to offer fully white-labeled email communication without managing the technical complexity of domain authentication and logging for hundreds of separate customers.

Invoicing & Billing Tools

Financial tools require high-trust emails like invoices, payment receipts, and statements to come directly from the client's domain (e.g., [email protected]). Ark ensures these critical transactional emails are properly authenticated for maximum deliverability, providing a seamless, professional experience that reinforces the client's brand.

Scheduling & Booking Applications

Scheduling apps send confirmations, reminders, and calendar invites. With Ark, these emails originate from the business's domain (e.g., [email protected]), increasing open rates and reducing the chance of emails being marked as spam. The automated domain setup makes customer onboarding effortless.

Internal Tool Builders (using AI)

Developers using AI assistants like Cursor or Windsurf to build internal tools can use Ark to add email features (password resets, alerts) in minutes. The AI-native API and documentation allow developers to describe what they need in natural language and get production-ready code, bypassing the traditional learning curve of email APIs.

Ark offers simple, transparent pay-per-email pricing that scales with your customer base. Plans start at $29 per month, which includes capacity for 10 customer domains and 50,000 emails. You can scale up to manage 1,000 domains or more as needed. Every plan includes unlimited team members, full access to the multi-tenant dashboard, automated DNS management, and all white-label features. A 7-day free trial is available with no credit card required to start.

How is Ark different from Resend or SendGrid?

Ark is purpose-built for multi-tenant platforms, while services like Resend, Postmark, or SendGrid are designed for a single company to send from its own domains. With Ark, multi-tenancy, per-customer domain management, and isolated logs are built-in defaults, not features you have to engineer on top of their API.

What does "AI-first" or "AI-native" mean for an email API?

It means Ark's documentation and tooling are optimized for AI coding assistants. The documentation is structured to be easily understood by AI models, reducing token usage. More importantly, Ark provides a Model Context Protocol (MCP) server, allowing AI agents to directly use its 26 tools to write code and manage email operations through conversation.

How difficult is it to onboard a new customer domain?

The process is designed to take about two minutes and often requires no support intervention. Ark detects the customer's DNS provider and gives them precise, plain-language instructions. For supported providers like Cloudflare, it can configure the necessary DNS records automatically, making the process self-service.

What is included in the $29/month starter plan?

The starter plan begins with the capacity to manage 10 customer domains and send up to 50,000 emails per month. It includes all core features: white-label email, automated DNS setup, per-tenant isolation, comprehensive logs and analytics, and unlimited team member seats. Pricing scales transparently as your domain and email volume grows.