Email SDK

Install the SDK, add the adapter for your provider, and call email.send(). The message shape stays the same if you switch providers later.

Start here

import { createEmailClient } from "@opencoredev/email-sdk";
import { resend } from "@opencoredev/email-sdk/resend";

export const email = createEmailClient({
  adapters: [resend({ apiKey: process.env.RESEND_API_KEY! })],
});

Now call email.send({ from, to, subject, text }). Add retries, fallback, plugins, and more adapters only when you need them.

Included

• 23 provider API adapters plus SMTP, 24 adapters total
• Typed adapter names in send, validate, adapter, and withAdapter
• Retries on the current adapter, then fallback only when delivery is known to have failed
• Independent sendMany calls and personalized sendPersonalized delivery
• Hooks, middleware, built-in plugins, and no-network test adapters
• Provider-native scheduled sends with sendAt
• CLI commands for adapter discovery, setup checks, and validated dry runs
• Optional approval-gated AI SDK tools for agent workflows

Runtime boundary

Email SDK is ESM-only and server-side. It supports Node.js 20+ and Bun 1.1+. Keep API keys and SMTP credentials out of browser bundles.