# Postmark + SMS-IT — Pipedream Connect

> Connect a user's Postmark and SMS-IT accounts and expose tools for both apps directly in your product or your agent.

- Apps: Postmark (`postmark`) + SMS-IT (`sms_it`)
- This page (HTML): https://pipedream.com/apps/postmark/integrations/sms-it
- One `external_user_id` owns both connected accounts, and each account stays independently revocable.

## One session, both toolsets (recommended)

- Endpoint: `https://remote.mcp.pipedream.net/v3`
- Headers: `Authorization: Bearer <token>` · `x-pd-project-id` · `x-pd-environment` · `x-pd-external-user-id` · `x-pd-app-slug: postmark,sms_it`
- `x-pd-app-slug` takes a comma-separated list, so `postmark,sms_it` is one session on one transport. Both toolsets arrive from a single `listTools()`, and a tool is called exactly as it would be in a single-app session.

```ts
import { Client } from "@modelcontextprotocol/sdk/client/index.js"
import { StreamableHTTPClientTransport } from "@modelcontextprotocol/sdk/client/streamableHttp.js"
import { PipedreamClient } from "@pipedream/sdk"

const pd = new PipedreamClient({
  projectId: process.env.PIPEDREAM_PROJECT_ID!,
  clientId: process.env.PIPEDREAM_CLIENT_ID!,
  clientSecret: process.env.PIPEDREAM_CLIENT_SECRET!,
  projectEnvironment: "production",
})

const accessToken = await pd.rawAccessToken

const transport = new StreamableHTTPClientTransport(
  new URL("https://remote.mcp.pipedream.net/v3"),
  {
    requestInit: {
      headers: {
        Authorization: `Bearer ${accessToken}`,
        "x-pd-project-id": process.env.PIPEDREAM_PROJECT_ID!,
        "x-pd-environment": "production",
        "x-pd-external-user-id": "{external_user_id}", // any stable ID for this user in your system
        "x-pd-app-slug": "postmark,sms_it",
      },
    },
  },
)

const mcp = new Client({ name: "my-agent", version: "1.0.0" })
await mcp.connect(transport)

const { tools } = await mcp.listTools()

// One list, both toolsets: Postmark and SMS-IT tools arrive
// together, each keyed by its own app's slug.

// e.g. run Create Domain:
const result = await mcp.callTool({
  name: "postmark-create-domain",
  arguments: {
    name: "Name",
    returnPathDomain: "Return Path Domain",
  },
})
```

Docs: [MCP guide](https://pipedream.com/docs/connect/mcp/developers.md)

## Both apps from your backend

```ts
import { PipedreamClient } from "@pipedream/sdk"

const pd = new PipedreamClient({
  projectId: process.env.PIPEDREAM_PROJECT_ID!,
  clientId: process.env.PIPEDREAM_CLIENT_ID!,
  clientSecret: process.env.PIPEDREAM_CLIENT_SECRET!,
  projectEnvironment: "production",
})

const externalUserId = "{external_user_id}" // any stable ID for this user in your system

const [postmarkTools, smsItTools] =
  await Promise.all([
    pd.components.list({ app: "postmark" }),
    pd.components.list({ app: "sms_it" }),
  ])

// One external user owns both connected accounts, so either app's tools
// run on their behalf with the same externalUserId.
```

Docs: [Managed auth guide](https://pipedream.com/docs/connect/managed-auth/quickstart.md) · [Tools guide](https://pipedream.com/docs/connect/components.md)

## Postmark

- API slug: `postmark` (use in MCP headers and tool keys)
- Auth: API key (Pipedream-managed)
- Categories: Marketing
- Website: https://postmarkapp.com/
- App page (HTML): https://pipedream.com/apps/postmark
- Tools: 27 actions · 4 triggers

Full tool list, API proxy, and SDK quickstart: https://pipedream.com/apps/postmark.md

### Actions (top 8 of 27)

- [Create Domain](https://pipedream.com/apps/postmark/actions/create-domain.md) — `postmark-create-domain`
- [Create Sender Signature](https://pipedream.com/apps/postmark/actions/create-signature.md) — `postmark-create-signature`
- [Delete Domain](https://pipedream.com/apps/postmark/actions/delete-domain.md) — `postmark-delete-domain`
- [Delete Sender Signature](https://pipedream.com/apps/postmark/actions/delete-signature.md) — `postmark-delete-signature`
- [Get Bounce Counts](https://pipedream.com/apps/postmark/actions/get-bounce-counts.md) — `postmark-get-bounce-counts`
- [Get Browser Usage](https://pipedream.com/apps/postmark/actions/get-browser-usage.md) — `postmark-get-browser-usage`
- [Get Click Counts](https://pipedream.com/apps/postmark/actions/get-click-counts.md) — `postmark-get-click-counts`
- [Get Domain](https://pipedream.com/apps/postmark/actions/get-domain.md) — `postmark-get-domain`

### Triggers (4)

- [New Domain](https://pipedream.com/apps/postmark/triggers/new-domain.md) — `postmark-new-domain`
- [New Email Opened](https://pipedream.com/apps/postmark/triggers/new-email-opened.md) — `postmark-new-email-opened`
- [New Inbound Email Received](https://pipedream.com/apps/postmark/triggers/new-inbound-email-received.md) — `postmark-new-inbound-email-received`
- [New Sender Signature](https://pipedream.com/apps/postmark/triggers/new-sender-signature.md) — `postmark-new-sender-signature`

## SMS-IT

- API slug: `sms_it` (use in MCP headers and tool keys)
- Auth: API key (Pipedream-managed)
- Categories: Marketing
- Website: https://www.smsit.ai/
- App page (HTML): https://pipedream.com/apps/sms-it
- Tools: 0 actions · 0 triggers

Full tool list, API proxy, and SDK quickstart: https://pipedream.com/apps/sms-it.md

---

- Postmark: https://pipedream.com/apps/postmark.md · SMS-IT: https://pipedream.com/apps/sms-it.md
- All apps: https://pipedream.com/apps — index: https://pipedream.com/llms.txt
- Pipedream docs for agents: https://pipedream.com/docs/llms.txt