Ark

Ark is the definitive white-label email API engineered for multi-tenant SaaS platforms. If you're building a CRM, helpdesk, invoicing tool, scheduling app, or any product where your customers need to send email from their own domains, Ark is your infrastructure solution. It eliminates the monumental complexity of managing hundreds or thousands of separate sender domains, SPF/DKIM records, and per-customer email logs. Unlike generic email services built for a single company, Ark is architected from the ground up for platform use cases, providing native tenant isolation, a unified management dashboard, and AI-powered tooling. With Ark, you integrate once and then onboard new customer domains in minutes, not weeks. This allows development teams to stop building and maintaining email infrastructure and instead focus entirely on shipping their core product features, backed by 99.9% deliverability and sub-second send times.

Native Multi-Tenant Architecture

Ark is built with the principle that you have customers, not just one sender. Every customer is automatically isolated with their own domains, dedicated sending logs, and individual analytics. This foundational feature means you never have to build complex tenant isolation layers on top of a generic API. Debugging is streamlined; you can instantly search and filter activity for any specific customer from a single, centralized dashboard, turning needle-in-a-haystack problems into simple queries.

AI-First Developer Experience with MCP Server

Accelerate integration and daily workflows with Ark's native Model Context Protocol (MCP) server, equipped with 26 powerful tools. This allows developers to send emails and manage configurations using natural language commands directly within AI coding assistants like Claude, Cursor, and Windsurf. It eliminates wrapper code and drastically simplifies the process, supported by AI-readable documentation that reduces token usage by tenfold for a faster, more intuitive development cycle.

Automated Domain & DNS Management

Onboarding new customer domains becomes a self-service, zero-support-ticket operation. Ark automatically detects the customer's DNS provider (e.g., Cloudflare, GoDaddy, Route53) and provides them with exact, step-by-step instructions. For supported providers, it can even configure records automatically. This removes the technical burden from your support team and eliminates frustrating onboarding calls explaining TXT records.

Unified White-Label Dashboard & Analytics

Gain complete visibility and control over your entire platform's email ecosystem from one intuitive dashboard. Monitor the status, volume, and deliverability rates for every domain across every tenant. This comprehensive view provides the insights needed to ensure performance and quickly pinpoint issues, making your platform more reliable and professional without requiring you to build a single analytics panel.

Multi-Tenant CRM & Helpdesk Platforms

CRM and helpdesk software requires sending notifications, ticket updates, and alerts from each client's domain to maintain brand integrity and trust. Ark enables these platforms to seamlessly manage thousands of unique sender domains, ensuring every automated message—from support replies to system alerts—appears authentically from the customer's business, not the software vendor.

Invoicing & Billing Applications

Financial communication demands the highest level of trust and deliverability. Invoicing tools use Ark to send bills, payment reminders, and receipts directly from addresses like [email protected]. Ark's robust authentication and per-domain management guarantee these critical emails land in the inbox, not spam, while providing clear logs for every transaction.

Scheduling & Booking SaaS

Scheduling platforms send confirmations, reminders, and calendar invites. With Ark, each business on the platform can send these time-sensitive communications from their own branded domain (e.g., [email protected]), enhancing professionalism and reducing no-shows with reliable, fast email delivery that recipients recognize and trust.

Custom Automation & Workflow Tools

Platforms like n8n or custom-built automation stacks that trigger emails as part of complex workflows benefit from Ark's simple API and serverless integrations (Vercel, Supabase). Developers can embed email actions directly into logic without managing domain infrastructure, perfect for sending personalized, automated sequences on behalf of end-users.

How is Ark different from Resend or SendGrid?

Ark is purpose-built for multi-tenant platforms, while services like Resend, SendGrid, or Amazon SES are designed for a single company to send from its own domains. With those tools, adding a second customer domain requires manual configuration and custom-built management layers. Ark provides native tenant isolation, a unified dashboard for all customer domains, and automated DNS setup out-of-the-box, saving months of development time.

What does "white-label email" mean with Ark?

White-label email means your customers can send emails that appear to come directly from their own company domain and brand, not yours. With Ark, you can provide each customer with addresses like [email protected] or [email protected]. This makes your platform feel like an integrated part of their business operations, increasing perceived value and trust.

How complex is the domain verification process for my customers?

The process is designed to be extremely simple, often taking just two minutes. Ark auto-detects the customer's DNS provider and gives them clear, provider-specific instructions. For many popular providers like Cloudflare, we can even auto-configure the necessary DNS records (SPF, DKIM) for them, requiring minimal technical knowledge and eliminating support overhead.

Can I try Ark before committing to a paid plan?

Yes. Ark offers a 7-day free trial with no credit card required to get started. This allows you to fully integrate the API, test domain onboarding, and evaluate the dashboard and deliverability with your own use case before any financial commitment.

Ark offers transparent, scalable pricing that grows with your customer base. Plans start at $29 per month, which includes 10 domains and 50,000 emails. This scales predictably as you add more domains and volume, supporting up to 1,000 domains on higher tiers. Every plan includes unlimited team members, ensuring your entire engineering and support team has access without per-seat fees. New users also receive $5 in credits to begin testing.