# Adapters (/docs/v/0.2.0/adapters)



Email SDK ships with 15+ adapters. Import only the adapter you use; the package does not ask you
to configure providers that are not on your send path.

Every adapter follows the same contract: map the fields it supports and throw a validation error for
fields the provider API cannot represent. Use the [SDK field support guide](/docs/v/0.2.0/adapters/field-support)
before choosing fallback routes.

<ProviderGrid />

## Import pattern [#import-pattern]

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

const email = createEmailClient({
  adapters: [
    resend({ apiKey: process.env.RESEND_API_KEY! }),
    smtp({
      host: process.env.SMTP_HOST!,
      auth: {
        user: process.env.SMTP_USER!,
        pass: process.env.SMTP_PASS!,
      },
    }),
  ],
  fallback: ["smtp"],
});
```

## Adapter groups [#adapter-groups]

| Group          | Adapters                                                                        |
| -------------- | ------------------------------------------------------------------------------- |
| Popular APIs   | Resend, Postmark, SendGrid, Mailgun, MailerSend, Brevo, Mailchimp Transactional |
| Infrastructure | SparkPost, Mailtrap, Scaleway, ZeptoMail, MailPace                              |
| Product-led    | Loops, Plunk                                                                    |
| Transport      | Built-in SMTP                                                                   |