Ark

Ark is the white-label email API engineered from the ground up for multi-tenant platforms. If you're building a SaaS product like a CRM, helpdesk, invoicing, or scheduling tool that sends email on behalf of your customers, Ark is your complete infrastructure solution. It eliminates the monumental friction of managing hundreds or thousands of customer domains by making multi-tenancy the default. Integrate once, and then onboard new customer domains in minutes, not weeks. Ark provides automatic DNS configuration, per-tenant isolation for logs and analytics, and sub-second delivery with 99.9% deliverability. The core value is ruthless efficiency: stop building and maintaining complex email infrastructure on top of generic APIs. With Ark, you get a purpose-built platform that lets your customers send authenticated email from their own domains, making your product feel like a native part of their business while you get back to building your core features.

Native Multi-Tenant Architecture

Ark is built from the core for platforms with multiple customers. Every tenant is automatically isolated with their own domains, dedicated sending logs, and individual analytics. This means you can instantly debug issues for a specific customer without sifting through everyone else's data, turning a needle-in-a-haystack search into a simple filtered query.

Automated Domain & DNS Configuration

Onboarding a new customer domain takes minutes, not support tickets. Ark automatically detects the customer's DNS provider (like Cloudflare or GoDaddy) and provides them with exact, step-by-step instructions. For some providers, it can even configure records automatically, removing the need for you to explain technical details like TXT or MX records.

Per-Customer White-Label Email

Give every customer a professional, branded email experience. Their transactional emails—invoices, notifications, alerts—come from their own domain (e.g., [email protected]), not yours. This white-label capability is built-in and seamless, enhancing your platform's value and integration into their workflow without any custom code on your part.

Unified Dashboard with Real-Time Analytics

Manage your entire customer base from a single, powerful dashboard. View the status, volume, and deliverability rates for every domain across every tenant in real-time. This centralized control gives you and your team immediate visibility into platform-wide performance and customer-specific issues.

CRM & Customer Support Platforms

CRM and helpdesk software needs to send notifications, ticket updates, and automated follow-ups from the customer's own domain to maintain brand consistency and trust. Ark enables this at scale, allowing the platform to manage thousands of unique sender domains effortlessly while providing isolated logs for each client.

Invoicing & Billing Software

Professional invoicing tools require that payment reminders, receipts, and statements come directly from the client's domain (e.g., [email protected]) to appear legitimate and avoid spam filters. Ark handles the complex domain authentication (SPF, DKIM, DMARC) for every client, ensuring high deliverability for critical financial communications.

Scheduling & Booking Applications

Scheduling apps send confirmations, reminders, and cancellations. With Ark, each business using the platform can send these emails from their own branded domain (e.g., [email protected]), improving open rates and customer experience without the developer building custom email routing logic.

Internal Tooling & Developer Platforms

Developers building internal tools or platforms that need to send notifications, alerts, or reports to different teams or external partners can use Ark to manage multiple sending identities cleanly. It simplifies the codebase by replacing a patchwork of email services and manual DNS management with one robust API.

How is Ark different from Resend or SendGrid?

Other email APIs like Resend, Postmark, or SendGrid are built for a single company to send from its own domains. Ark is engineered exclusively for multi-tenant platforms that send email on behalf of their customers. It has built-in features for tenant isolation, bulk domain management, and per-customer analytics that you would otherwise have to build yourself on top of those other services.

What does "white-label email" mean?

White-label email means your customers' emails are sent using their own domain name and brand, not yours. Instead of emails coming from [email protected], they come from [email protected]. Ark provides the full infrastructure to make this happen automatically, including handling all the complex backend DNS authentication for each domain.

How long does it take to connect a new customer domain?

Typically just a few minutes. Ark guides the customer through the process with provider-specific instructions. For supported DNS providers, much of the configuration can be automated. This allows for a fully self-service onboarding experience, drastically reducing the support burden on your team.

Is there a free trial?

Yes. Ark offers a 7-day free trial with no credit card required to start. This allows you to integrate the API and test the full workflow of connecting domains and sending emails to ensure it fits your platform's needs before any financial commitment.

Ark offers transparent, scalable pricing starting at $29 per month. The entry plan includes 10 domains and 50,000 emails, designed to grow with your customer base. You can scale up to manage 1,000 domains or more as needed. All plans include unlimited team members, access to the full API, and the centralized multi-tenant dashboard.