# Postmark (/docs/v/0.6.0/adapters/postmark)



The Postmark adapter calls the Postmark Email API directly. It does not add a runtime dependency.

<ProviderBadge adapter="postmark" />

## Before live sends [#before-live-sends]

Create a Postmark server token for the server and message stream you want to send through. Make sure the sender signature or domain is approved in Postmark before using a production `from` address.

## Configure [#configure]

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

const email = createEmailClient({
  adapters: [
    postmark({
      serverToken: process.env.POSTMARK_SERVER_TOKEN!,
      messageStream: "outbound",
    }),
  ],
});
```

## Send [#send]

```ts
const result = await email.send({
  from: "Acme <hello@acme.com>",
  to: [{ email: "user@example.com", name: "Ada" }],
  cc: "billing@example.com",
  replyTo: "support@example.com",
  subject: "Receipt",
  html: "<p>Thanks for your order.</p>",
  headers: {
    "X-Order-ID": "ord_123",
  },
  metadata: {
    orderId: "ord_123",
  },
  tags: [{ name: "type", value: "receipt" }],
  attachments: [
    {
      filename: "receipt.txt",
      content: "Order ord_123",
      contentType: "text/plain",
    },
  ],
});

console.log(result.provider, result.messageId);
```

Postmark supports one Email SDK tag. The adapter serializes the first tag as `name:value` and rejects additional tags before the API call.

## Options [#options]

| Option          | Type                     | Required | Notes                                      |
| --------------- | ------------------------ | -------- | ------------------------------------------ |
| `serverToken`   | `string`                 | Yes      | Postmark server token.                     |
| `baseUrl`       | `string`                 | No       | Defaults to `https://api.postmarkapp.com`. |
| `messageStream` | `string`                 | No       | Postmark message stream.                   |
| `fetch`         | `typeof fetch`           | No       | Useful for tests or custom runtimes.       |
| `headers`       | `Record<string, string>` | No       | Extra request headers.                     |

## Response [#response]

The adapter maps Postmark `MessageID` to `id` and `messageId`, and maps returned `To` to `accepted`.

## CLI smoke test [#cli-smoke-test]

```bash
POSTMARK_SERVER_TOKEN="..." npx email-sdk send \
  --adapter postmark \
  --from "Acme <hello@acme.com>" \
  --to user@example.com \
  --subject "Postmark test" \
  --text "It works"
```