Ark

Ark is the definitive white-label email API engineered for B2B software platforms and SaaS companies that send email on behalf of their customers. Unlike generic email services built for a single sender, Ark is architected from the ground up for multi-tenancy, enabling platforms like CRMs, helpdesks, invoicing tools, and scheduling apps to seamlessly manage hundreds or thousands of unique customer domains from a single, unified dashboard. Its core value proposition is eliminating the immense infrastructure burden of email, allowing development teams to stop building and maintaining complex domain authentication, isolation, and logging systems and instead refocus engineering resources on core product features. By providing native tools for automatic DNS configuration, per-tenant analytics, and AI-first integration, Ark dramatically reduces time-to-market and operational overhead while guaranteeing enterprise-grade deliverability of 99.9% with sub-second send times. For platform businesses, Ark transforms email from a costly, time-sucking complexity into a reliable, scalable, and fully branded communication channel that strengthens their product's professional value.

Native Multi-Tenant Architecture

Ark is fundamentally built for platform use, treating each customer as an isolated tenant by default. This means every customer gets their own dedicated domain management, sending logs, analytics, and deliverability metrics. This built-in isolation eliminates the need for developers to engineer complex data partitioning and access controls on top of a generic API, saving hundreds of engineering hours and providing clear, auditable trails for debugging customer-specific issues.

AI-First Integration & Documentation

Designed for modern development workflows, Ark features a native MCP server with 26 specialized tools, allowing developers using AI assistants like Claude, Cursor, and Windsurf to generate production-ready email integration code through natural language commands. Its AI-readable documentation reduces token usage by 10x, streamlining the development process and enabling faster, more accurate code generation without the typical debugging cycles associated with email API integration.

Automated Domain & DNS Management

Ark simplifies the most cumbersome part of white-label email: domain setup. The platform automatically detects a customer's DNS provider (e.g., Cloudflare, GoDaddy, Route53) and provides them with precise, step-by-step instructions. For supported providers, it can configure SPF, DKIM, and DMARC records automatically, turning a process that typically requires support tickets and Zoom calls into a self-service, two-minute task that enhances customer onboarding.

Per-Customer Analytics & Deliverability Dashboard

Platforms gain unparalleled visibility with Ark's centralized dashboard that displays sending metrics, status, and deliverability rates segmented by individual tenant and domain. This allows teams to instantly pinpoint issues, such as a specific customer's dropping delivery rate, and access their isolated logs for rapid debugging. This transparency turns email from a black box into a manageable, data-driven component of your service.

B2B SaaS Platforms & Marketplaces

Platforms that operate as a service for other businesses, such as CRM, ERP, or project management tools, require each client's communications to originate from their own branded domain. Ark enables these platforms to offer fully white-labeled email as a seamless feature, allowing every client to send invoices, notifications, and alerts from addresses like [email protected], thereby enhancing the platform's perceived value and integration depth.

Helpdesk & Customer Support Software

Helpdesk solutions need to send ticket updates, auto-responses, and support communications that appear directly from their client's company. Ark manages the domain authentication and sending infrastructure for hundreds of client domains simultaneously, ensuring high deliverability for critical support emails while providing the platform with tools to monitor and troubleshoot each client's email stream independently.

Financial & Invoicing Applications

Applications that generate and send sensitive financial documents, such as invoices, receipts, and payment reminders, mandate strict email authenticity to avoid phishing filters and maintain professionalism. Ark ensures these emails are properly authenticated with SPF, DKIM, and DMARC for every client domain, directly improving trust and open rates for time-sensitive financial communications.

Scheduling & Booking Tools

Scheduling platforms send calendar invites, reminders, and confirmations that must appear to come from the professional or business being booked. Ark allows these tools to connect each user's domain effortlessly, ensuring meeting invites land directly in the recipient's primary inbox with the correct sender branding, which is critical for reducing no-shows and maintaining a professional workflow.

How is Ark different from Resend or SendGrid?

Ark is purpose-built for multi-tenant platforms, while services like Resend, SendGrid, and Amazon SES are designed primarily for a single company to send from its own domains. With Ark, multi-tenancy, per-customer domain isolation, and management dashboards are native features. Using a single-sender tool for a platform requires building complex tenant isolation, domain management, and logging systems on top of their API, which Ark provides out-of-the-box.

What does the onboarding process for a new customer domain look like?

The process is designed for self-service. When a customer adds their domain in your platform, Ark detects their DNS provider and presents them with clear, provider-specific instructions. For many providers like Cloudflare, it can configure the necessary DNS records automatically. Typically, a customer can complete authentication in under two minutes without requiring support intervention, drastically reducing your onboarding overhead.

How does Ark ensure high email deliverability?

Ark guarantees a 99.9% deliverability rate through a combination of robust infrastructure, sub-second delivery speeds, and automatic, proper configuration of critical authentication protocols (SPF, DKIM, DMARC) for every domain. Furthermore, its architecture isolates sending reputations per tenant, preventing one customer's poor practices from affecting another's, and provides real-time webhooks for tracking opens, clicks, and bounces.

Can my team manage all customer domains from one place?

Absolutely. Ark provides a centralized dashboard where your team can view, manage, and debug all connected customer domains and their sending activity. You can see the status, volume, and deliverability rate for every tenant, search across all logs, and drill down into individual customer analytics without switching contexts or tools, providing complete operational control.

Ark offers a transparent pricing model starting at $29 per month, which includes 10 domains and 50,000 emails. Plans are designed to scale with your customer base, supporting up to 1,000 domains. The cost is $0.50 per 1,000 emails sent beyond the included volume. Every plan includes unlimited team members. A 7-day free trial is available with no credit card required to begin.