Regional email
for developers.
Boundry is the regional email API for developers. Your project API keys, domains, messages, and events stay in the data plane you choose. Sydney is Boundry’s only live region. Native inbound remains deployment-gated.
Get started
Set up each Boundry project independently. It gives you a genuinely separate delivery workspace and data boundary.
- QuickstartSend your first email through a Boundry regional project.
- Regional projectsHow Boundry projects pin data to a single region.
- Verify a domainProve domain ownership before sending with Boundry.
- Connect an AI agentAuthorize an MCP client to manage one Boundry project without sharing a password or API key.
- Migrate from ResendReplace an outbound Resend workload with Boundry using staged validation and a safe rollback path.
Send a transactional message through your project’s regional endpoint, attach the domains it sends from, and read what comes back.
Platform
Webhooks are configured inside a project and delivered from that project’s data plane. Every delivery is HMAC-signed and recorded.
SDKs
Official TypeScript, Python, Go, Ruby, and PHP clients for the Boundry API.
- JavaScript SDKUse boundry-sdk with Node, Workers, Deno, Bun and browser-compatible runtimes.
- Python SDKInstall and use the boundry-sdk Python client.
- Go SDKInstall and use the official Boundry Go module.
- Ruby SDKInstall and use the official Boundry Ruby gem.
- PHP SDKInstall and use the official Boundry Composer package.
Framework guides
Use Boundry from major backend frameworks, runtimes, and edge platforms.
- Node.jsSend regional email with Boundry and Node.js.
- Next.jsSend regional email with Boundry and Next.js.
- RemixSend regional email with Boundry and Remix.
- NuxtSend regional email with Boundry and Nuxt.
- TanStack StartSend regional email with Boundry and TanStack Start.
- SvelteKitSend regional email with Boundry and SvelteKit.
- ExpressSend regional email with Boundry and Express.
- RedwoodJSSend regional email with Boundry and RedwoodJS.
- HonoSend regional email with Boundry and Hono.
- BunSend regional email with Boundry and Bun.
- AstroSend regional email with Boundry and Astro.
- Encore.tsSend regional email with Boundry and Encore.ts.
- Better AuthSend regional email with Boundry and Better Auth.
- Vercel FunctionsSend regional email with Boundry and Vercel Functions.
- AWS LambdaSend regional email with Boundry and AWS Lambda.
- Cloudflare WorkersSend regional email with Boundry and Cloudflare Workers.
- DenoSend regional email with Boundry and Deno.
- Supabase Edge FunctionsSend regional email with Boundry and Supabase Edge Functions.
- PythonSend regional email with Boundry and Python.
- FlaskSend regional email with Boundry and Flask.
- FastAPISend regional email with Boundry and FastAPI.
- DjangoSend regional email with Boundry and Django.
- GoSend regional email with Boundry and Go.
- Encore.goSend regional email with Boundry and Encore.go.
- RubySend regional email with Boundry and Ruby.
- Ruby on RailsSend regional email with Boundry and Ruby on Rails.
- SinatraSend regional email with Boundry and Sinatra.
- PHPSend regional email with Boundry and PHP.
- LaravelSend regional email with Boundry and Laravel.
- SymfonySend regional email with Boundry and Symfony.
API reference
Boundry regional API reference, grouped by resource, with the OpenAPI document behind it.
- OverviewBoundry regional API reference.
- EmailsSend transactional messages and inspect accepted email records.
- DomainsManage the sending identities attached to a regional project.
- WebhooksConfigure signed event delivery for a regional project.
- OpenAPI documentThe machine-readable contract for the regional API.
- llms.txtIntegration instructions written for AI agents.