CONNECT APP

Build with MailboxValidator

Secure and reliable email validation service to check for invalid email addresses. It connects to the mail server and checks whether the mailbox exists or not. It reduces email bounce rate & costs. It increases conversion rate & sender reputation.

Developer Tools

API key

Visit MailboxValidator ↗ Start building

MCP

Give your agent MailboxValidator tools

Every MailboxValidator action is exposed as an MCP tool on Pipedream's remote server. Point a client at it with your end user's ID and Connect resolves that user's MailboxValidator account for each tool call — you store no tokens.

Pipedream Connect

// accessToken: mint a short-lived token with the Connect SDK — see the MCP guide
const transport = new StreamableHTTPClientTransport(
  new URL("https://remote.mcp.pipedream.net/v3"),
  {
    requestInit: {
      headers: {
        Authorization: `Bearer ${accessToken}`,
        "x-pd-project-id": "{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": "mailboxvalidator",
      },
    },
  },
)

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

const { tools } = await mcp.listTools()

// e.g. run Validate Email:
const result = await mcp.callTool({
  name: "mailboxvalidator-validate-email",
  arguments: {
    email: "Email Address",
  },
})

# access_token: mint a short-lived token with the Connect SDK — see the MCP guide
headers = {
    "Authorization": f"Bearer {access_token}",
    "x-pd-project-id": "{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": "mailboxvalidator",
}

async with streamablehttp_client("https://remote.mcp.pipedream.net/v3", headers=headers) as (read, write, _):
    async with ClientSession(read, write) as session:
        await session.initialize()
        tools = await session.list_tools()

        # e.g. run Validate Email:
        result = await session.call_tool("mailboxvalidator-validate-email", {
            "email": "Email Address",
        })

MCP guide →

API PROXY

Call the MailboxValidator API directly

For an endpoint with no pre-built tool, the Connect proxy forwards your request to the MailboxValidator API with the connected user's credentials attached. You store no tokens and write no refresh logic.

Pipedream Connect

const resp = await pd.proxy.get({
  externalUserId: "{external_user_id}", // any stable ID for this user in your system
  accountId: "apn_xxxxxxx",
  url: "https://api.mailboxvalidator.com/v1/validation/single",
})

// Any allowed MailboxValidator endpoint works here. Pipedream attaches the
// connected account's credentials to the outgoing request.

# The path segment is the target URL, URL-safe base64 encoded:
# https://api.mailboxvalidator.com/v1/validation/single

curl "https://api.pipedream.com/v1/connect/{project_id}/proxy/aHR0cHM6Ly9hcGkubWFpbGJveHZhbGlkYXRvci5jb20vdjEvdmFsaWRhdGlvbi9zaW5nbGU?external_user_id={external_user_id}&account_id=apn_xxxxxxx" \
  -H "Authorization: Bearer {access_token}" \
  -H "x-pd-environment: production"

API proxy guide →

SDK

Run MailboxValidator actions from your backend

Connect a user's MailboxValidator account once, then run Validate Email on their behalf from your own code — TypeScript, Python, or plain HTTP.

Pipedream Connect

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 result = await pd.actions.run({
  id: "mailboxvalidator-validate-email",
  externalUserId: "{external_user_id}", // any stable ID for this user in your system
  configuredProps: {
    mailboxvalidator: { authProvisionId: "apn_xxxxxxx" },
    email: "Email Address",
  },
})

from pipedream import Pipedream

pd = Pipedream(
    client_id="{oauth_client_id}",
    client_secret="{oauth_client_secret}",
    project_id="{project_id}",
    project_environment="production",
)

result = pd.actions.run(
    id="mailboxvalidator-validate-email",
    external_user_id="{external_user_id}",  # any stable ID for this user in your system
    configured_props={
        "mailboxvalidator": {"authProvisionId": "apn_xxxxxxx"},
        "email": "Email Address",
    },
)

curl -X POST https://api.pipedream.com/v1/connect/{project_id}/actions/run \
  -H "Content-Type: application/json" \
  -H "X-PD-Environment: production" \
  -H "Authorization: Bearer {access_token}" \
  -d '{
    "external_user_id": "{external_user_id}",
    "id": "mailboxvalidator-validate-email",
    "configured_props": {
      "mailboxvalidator": { "authProvisionId": "apn_xxxxxxx" },
      "email": "Email Address"
    }
  }'