Smartsheet can hold the data and event that starts an email, while Volanea can deliver the message. To send email from Smartsheet reliably, connect Smartsheet’s developer webhook to a server-side relay that reads the changed row and calls the Volanea email API.

There is an important architectural detail up front: Volanea does not provide a native Smartsheet marketplace app or plug-in. Smartsheet webhooks are still a strong integration path, but they notify your endpoint about a change; they do not transform a row into an email or safely hold a third-party email API key. The durable solution is therefore Smartsheet → your webhook endpoint → Smartsheet row lookup → Volanea.

What this integration does

This integration sends a transactional email when a new row is added to a chosen Smartsheet sheet. A submitted Smartsheet form is a common source of those rows, but the trigger is the row creation itself—not the form UI. That distinction matters because rows may also be created through the API, imports, copy/paste activity, or another connected workflow.

A typical implementation looks like this:

A person submits a Smartsheet form, or a user/process creates a new row.
Smartsheet emits a row.created webhook event to an HTTPS endpoint you control.
Your endpoint records the event ID, acknowledges Smartsheet quickly, and retrieves the affected row through the Smartsheet API.
The relay maps named sheet columns such as Email, First name, and Request type into an email payload.
The relay sends that payload to Volanea with a server-side API key.
The relay records the delivery request result and, optionally, writes a status or message ID back to Smartsheet.

This is not just a workaround for the lack of a point-and-click app. It separates responsibilities properly. Smartsheet remains the operating system for your workflow and source data; your service enforces email rules and idempotency; Volanea handles delivery.

The real Smartsheet trigger: a new row

For this guide, the concrete trigger is Smartsheet’s row.created event on one specific sheet. If a form creates a new submission row, that submission produces the row-created event. If your process instead updates an existing row after review, use row.updated and add a condition in your relay so every minor edit does not resend the same email.

Why a row-created event is safer than “send on any update”

A sheet row often changes many times. Someone may correct a telephone number, attach a file, assign an owner, or change a status. Sending on every update can produce duplicate acknowledgements and confusing customer messages.

Starting with row.created is straightforward when the email should be an immediate receipt, lead acknowledgement, or onboarding notice. For an approval workflow, a better design is to listen for row.updated, fetch the row, and send only when a Stage column has moved into a specific value such as Approved.

The event itself does not necessarily mean the row has every business field you need. A person may create a row manually and fill cells afterward, or an automation may populate values in a subsequent operation. Your relay should validate the fetched row before sending rather than treating an event as proof that the recipient address and consent data are ready.

Scope the webhook to one sheet

Smartsheet’s Webhooks API lets a developer create a webhook with a sheet scope and the numeric sheet ID as scopeObjectId. The following request illustrates the registration shape for a row-created trigger:

curl --request POST "https://api.smartsheet.com/2.0/webhooks" \
  --header "Authorization: Bearer $SMARTSHEET_ACCESS_TOKEN" \
  --header "Content-Type: application/json" \
  --data '{
    "name": "Send Volanea email when a row is created",
    "callbackUrl": "https://automation.example.com/smartsheet/events",
    "scope": "sheet",
    "scopeObjectId": 1234567890123456,
    "events": ["row.created"],
    "version": 1
  }'

Replace the sheet ID and callback URL. The endpoint must be public HTTPS and must participate in Smartsheet’s webhook verification flow before events are delivered. Keep webhook creation and renewal in deployment code or an administrative script, rather than relying on a developer’s personal machine or expiring personal token.

Why the webhook cannot call Volanea directly

It is tempting to put a Volanea endpoint into callbackUrl and expect Smartsheet to post an email-ready body. That will not work safely or correctly.

A Smartsheet webhook callback is an event notification. Its job is to identify what changed. It is not an arbitrary HTTP action builder where you can define a destination method, add a Volanea Authorization header, create a JSON template, or keep a secret email credential. In addition, the callback event does not contain the complete row cell data needed to personalize a message.

The correct callback URL is an endpoint you own: a small Node, Python, Go, .NET, serverless, or container service. That service can safely use two server-side credentials:

A Smartsheet access token with access limited to the target sheet or workspace.
A Volanea API key with the narrowest practical sending permissions and a verified sending domain.

The Volanea key lives in the relay’s secret manager or encrypted environment configuration—not in a Smartsheet cell, form default, browser-side script, URL parameter, or client-visible configuration. On the Smartsheet side, store only non-secret values such as the callback URL and the webhook configuration. Anyone who can inspect a client-facing app or a shared sheet must not be able to extract a credential that can send email as your domain.

For Volanea’s current request schema and authentication guidance, consult the email API reference and setup guides before deploying. Keep the key separate for development, staging, and production so testing a form cannot accidentally send production mail.

What Smartsheet actually posts to your endpoint

A key implementation fact is that a Smartsheet webhook event is compact. For a row event, it identifies the sheet and row; it does not include a convenient object containing every column name and cell value.

A callback body has an events array. A row-created notification follows this general Smartsheet event shape:

{
  "events": [
    {
      "objectType": "row",
      "eventType": "created",
      "id": "event-id-from-smartsheet",
      "userId": 9876543210987654,
      "timestamp": "2026-10-13T14:22:31Z",
      "objectId": 1234567890123456,
      "rowId": 8765432109876543
    }
  ]
}

The values above are examples, but the meaning is important: objectId is the sheet identifier for this scoped event, and rowId identifies the row to retrieve. Do not expect a field such as email, first_name, or status in this callback. Your webhook service must call Smartsheet’s row endpoint after receiving the event.

This approach also avoids a common misconception about no-code connectors. A connector may show columns as fields after it has read the sheet, but the raw webhook notification remains an event signal. Your implementation should explicitly handle the extra lookup and its failure modes.

Read the row, then map column IDs

Smartsheet’s row response includes a cells array. Each cell is associated with a numeric columnId, while the actual value is generally in value and the display-oriented form can be in displayValue. Fetch the row using:

GET https://api.smartsheet.com/2.0/sheets/{sheetId}/rows/{rowId}
Authorization: Bearer {SMARTSHEET_ACCESS_TOKEN}

For stable production mapping, first retrieve the sheet columns, identify the IDs for columns such as Email, First Name, and Request Type, and store those IDs as protected service configuration. Column titles are understandable to people but can be renamed; IDs are the durable API reference. If the sheet is copied to another environment, use a deployment configuration step to refresh the IDs.

Working webhook-to-email relay example

The following Node.js example handles the verification handshake, accepts batches of events, deduplicates each event, fetches the changed row, maps cells by column ID, and sends an email through Volanea. It is intentionally written as a small relay rather than browser code, because both API tokens must remain private.

import express from "express";

const app = express();
app.use(express.json({ type: "application/json" }));

const SMARTSHEET_TOKEN = process.env.SMARTSHEET_ACCESS_TOKEN;
const VOLANEA_API_KEY = process.env.VOLANEA_API_KEY;
const FROM = "Requests <requests@your-verified-domain.example>";

// Set these once from GET /2.0/sheets/{sheetId}/columns in each environment.
const COLUMN = {
  email: Number(process.env.SMARTSHEET_EMAIL_COLUMN_ID),
  firstName: Number(process.env.SMARTSHEET_FIRST_NAME_COLUMN_ID),
  requestType: Number(process.env.SMARTSHEET_REQUEST_TYPE_COLUMN_ID)
};

// Replace with Redis, Postgres, DynamoDB, or another durable store in production.
const processedEventIds = new Set();

function cellsToValues(cells) {
  return Object.fromEntries(
    cells.map((cell) => [String(cell.columnId), cell.value ?? cell.displayValue ?? ""])
  );
}

function htmlEscape(value) {
  return String(value)
    .replaceAll("&", "&amp;")
    .replaceAll("<", "&lt;")
    .replaceAll(">", "&gt;")
    .replaceAll('"', "&quot;")
    .replaceAll("'", "&#039;");
}

async function getRow(sheetId, rowId) {
  const response = await fetch(
    `https://api.smartsheet.com/2.0/sheets/${sheetId}/rows/${rowId}`,
    { headers: { Authorization: `Bearer ${SMARTSHEET_TOKEN}` } }
  );
  if (!response.ok) throw new Error(`Smartsheet row lookup failed: ${response.status}`);
  return response.json();
}

async function sendWithVolanea({ to, firstName, requestType }) {
  const safeName = htmlEscape(firstName || "there");
  const safeRequestType = htmlEscape(requestType || "request");

  const response = await fetch("https://api.volanea.com/v1/emails", {
    method: "POST",
    headers: {
      Authorization: `Bearer ${VOLANEA_API_KEY}`,
      "Content-Type": "application/json"
    },
    body: JSON.stringify({
      from: FROM,
      to: [to],
      subject: `We received your ${requestType || "request"}`,
      html: `<p>Hi ${safeName},</p><p>We received your ${safeRequestType}. We will be in touch shortly.</p>`,
      text: `Hi ${firstName || "there"},\n\nWe received your ${requestType || "request"}. We will be in touch shortly.`
    })
  });

  if (!response.ok) {
    throw new Error(`Volanea send failed: ${response.status} ${await response.text()}`);
  }
  return response.json();
}

app.post("/smartsheet/events", async (req, res) => {
  // Smartsheet sends this header while verifying a newly created webhook.
  const challenge = req.get("Smartsheet-Hook-Challenge");
  if (challenge) {
    res.set("Smartsheet-Hook-Response", challenge);
    return res.sendStatus(200);
  }

  // Acknowledge promptly. Queue the body before doing API work in production.
  res.sendStatus(200);

  for (const event of req.body.events ?? []) {
    if (event.objectType !== "row" || event.eventType !== "created") continue;
    if (processedEventIds.has(event.id)) continue;
    processedEventIds.add(event.id);

    try {
      const row = await getRow(event.objectId, event.rowId);
      const values = cellsToValues(row.cells ?? []);
      const email = String(values[String(COLUMN.email)] || "").trim();

      if (!email || !email.includes("@")) {
        console.warn("Not sending: row has no usable recipient", { rowId: event.rowId });
        continue;
      }

      await sendWithVolanea({
        to: email,
        firstName: values[String(COLUMN.firstName)],
        requestType: values[String(COLUMN.requestType)]
      });
    } catch (error) {
      console.error("Smartsheet-to-Volanea event failed", { event, error });
      // Send this failure to a durable queue/dead-letter system for retry.
    }
  }
});

app.listen(process.env.PORT || 3000);

The email call in the example is the essential mapping: the Email column becomes to, the static verified mailbox becomes from, and the first-name and request-type columns become subject and body content. Validate the exact Volanea request fields against your account’s API documentation, especially if you use templates, tags, reply-to addresses, attachments, or campaign features.

Set up the sheet for dependable data

An event-driven email flow is only as reliable as the sheet columns it reads. Create clear columns and define what each one means before connecting the webhook.

A practical request sheet might include:

Email: recipient address; required for a send.
First Name: personalization value; optional, with a neutral fallback.
Request Type: used in subject/body or to select an approved template.
Email Consent: a checkbox or controlled value when the message is promotional rather than transactional.
Send Status: values such as Pending, Sent, Skipped, or Failed.
Volanea Message ID: delivery request identifier returned by the email API.
Sent At: a timestamp maintained by the relay after a successful send.

Use a controlled dropdown for values that select an email path. Free-text labels such as approve, Approved , and APPROVED turn into fragile conditional logic. If the sheet is used by many people, lock formula and audit columns where appropriate, but do not treat a visual lock as a substitute for server-side validation.

For recipient addresses, validate format in your relay and consider checking address quality before a nonessential send. A free email address verification tool can help test individual addresses during troubleshooting, while production logic should still follow your consent and suppression policies.

Authentication and secret handling

There are two separate trust boundaries in this design. Smartsheet must be allowed to notify your endpoint, and your endpoint must be allowed to read the row. Volanea must then accept the email request from that same endpoint.

Store credentials on the server, not in the sheet

Place SMARTSHEET_ACCESS_TOKEN and VOLANEA_API_KEY in a hosted secret manager or the encrypted environment-variable facility of your deployment platform. Apply access control so only the production relay can read production values. Rotate keys when an administrator leaves, a token appears in logs, or a credential may have been exposed.

Never put the Volanea API key in:

A Smartsheet cell, hidden column, attachment, or formula.
A prefilled form URL.
Front-end JavaScript or a browser extension.
A Zap description, support ticket, screenshot, or source repository.
The webhook callback URL as a query parameter.

The Smartsheet API token deserves the same treatment. Even if it cannot send email directly, it can expose or alter sheet information within its authorization scope.

Verify webhook requests

Implement Smartsheet’s webhook verification handshake and follow its callback authentication guidance. The challenge response in the code is required during setup, but it is not a complete substitute for request verification and network controls. Use the shared-secret/signature mechanism provided for the webhook where available, reject malformed requests, and log request IDs without logging personal data or secrets.

Do not perform a long chain of network calls before acknowledging an incoming notification. Put the parsed event into a durable queue first, then return success. This preserves the webhook service’s responsiveness and gives your worker a controlled retry policy.

When this breaks: failures in the Smartsheet-to-Volanea hop

Every automated email workflow needs a failure design. The dangerous outcome is rarely a visible error page; it is a duplicate customer email, a silently skipped recipient, or a message generated from partial row data.

Retries can cause duplicate sends

Webhook systems may redeliver events when a callback times out, returns a non-success response, or suffers a network interruption. Your endpoint may also finish the Volanea send but crash before recording that success. Retrying blindly can then create a second email.

Treat Smartsheet’s event id as an idempotency key. Store it durably before or alongside processing, with a status such as received, sending, sent, or failed. A production database table keyed by event ID is far safer than the in-memory Set shown in the sample. If you retry a Volanea request, use any API-supported idempotency facility and maintain your own unique send key as well.

For workflows where multiple events can legitimately refer to the same customer request, add a business-level guard too. For example, make the sheet row ID plus message type unique: 8765432109876543:request-received. That blocks a duplicate even if two distinct events arise around the same operational action.

Webhook timeouts and slow row lookups

A webhook endpoint can time out because of a cold serverless start, slow database, blocked outbound DNS, or a delayed Smartsheet row lookup. If the request handler waits for all of those steps and the Volanea API call, it increases the chance of redelivery.

Respond quickly after validation and queue the work. Monitor queue age, failed jobs, endpoint response time, and Volanea API error rates separately. A successful 200 response to Smartsheet only means the event was accepted by your relay; it should not be reported internally as proof that email was delivered.

Missing payload fields and missing row values

The webhook payload intentionally does not include your sheet cells. This can surprise teams that expect Email or Stage in the event itself. Retrieve the row every time, and treat absent or blank required cells as a skip or a retryable pending state—not as a value to guess.

Also test with the actual Smartsheet account, sheet permissions, and feature availability used in production. Connector capabilities and access can vary by account plan, licensed user role, and API permissions; a user who can submit a form may not be the integration identity that can read all row data. Keep the webhook integration account’s access explicit, and alert when a row lookup returns authorization or not-found errors.

A row can be created before it is ready

Form submissions usually create a complete row in one action, but other integrations may create a row first and populate cells later. If that is your workflow, do not send on row.created. Instead, trigger on row.updated and send only when a Ready to Send checkbox becomes true or a controlled Stage value becomes Ready.

Your worker should re-read the row immediately before sending if a short delay is possible. For high-value workflows, use a short scheduled retry window for incomplete rows rather than assuming a missing email address is permanent.

Use row updates for approval and stage-change emails

New-row emails are ideal for confirmations. Approval notices, renewal prompts, and assignment emails often need a stage transition instead.

Register for row.updated, fetch the row, and evaluate the current values. To avoid sending whenever any cell is edited, model the send as a state transition in your own record. A simple rule is: send the approved email only if the current Stage is Approved and there is no existing successful rowId:approved send record.

This is more robust than attempting to infer the previous cell value from a generic event. Your database becomes the source of truth for what emails the integration has already requested, while Smartsheet remains the current workflow state.

Alternatives when you do not want to host a relay

A hosted relay is the most controllable route, but it is not the only operational option. Smartsheet has integrations with automation platforms such as Zapier and Make. Those platforms can watch for a new row and perform an HTTP request to an email API, subject to the triggers, authentication controls, task limits, and plan features available in your account.

A no-code route can be appropriate for a low-volume internal alert or a proof of concept. Configure it so the Volanea credential is stored in the automation platform’s protected connection or secret field, never in sheet data. Add filters for blank recipient addresses and a deduplication strategy where the platform supports it.

For customer-facing receipts, compliance-sensitive messages, or substantial volume, a dedicated relay has meaningful advantages:

You control idempotency, queueing, logs, and incident response.
You can validate consent, allowed domains, and template variables centrally.
You can version email content in source control.
You can write status and message identifiers back to the exact Smartsheet row.
You avoid tying critical delivery behavior to a single automation user’s personal connection.

Deliverability and message design still matter

Connecting the APIs only initiates mail. It does not guarantee inbox placement or make an unsuitable message transactional. Use a verified sending domain, publish the authentication records required for the domain, and keep the From identity consistent with the business process represented in the sheet.

Separate different message classes. A form receipt that confirms a request is normally transactional. A follow-up that promotes unrelated services is marketing mail and should be sent only under an appropriate consent basis, with unsubscribe handling and audience controls. Do not use a form submission as a reason to add someone to an unrelated campaign.

Keep personalized fields modest and safe. Escape text injected into HTML, as the example does. Avoid placing sensitive form values in subjects, which may appear in inbox previews and forwarded conversations. If a sheet contains health, financial, HR, or security data, minimize what reaches the email body and strictly control who can access relay logs.

A production checklist

Before enabling the workflow for real recipients, verify the complete path with a test sheet and a mailbox you control.

Confirm the sending domain is ready in Volanea and the From address is authorized.
Create a least-privilege Smartsheet integration identity with access to the target sheet.
Create and verify the webhook using a public HTTPS callback endpoint.
Retrieve sheet columns and configure stable column IDs in server-side environment variables.
Submit a test form and confirm the resulting row.created event reaches the relay.
Confirm the relay can fetch the specified row and maps the expected value fields.
Test blank, malformed, and duplicate recipient addresses.
Force a retry or replay in a nonproduction environment and confirm only one email is sent.
Record the Volanea response identifier and a send status against the row or in your integration database.
Alert on failed jobs, authorization errors, and sustained webhook or API latency.

Once the basic confirmation flow works, add one change at a time: templates, reply-to routing, attachments, stage-based messages, or status write-backs. Small, observable increments make it much easier to know whether a problem comes from Smartsheet data, the relay, or email delivery.

Conclusion

The reliable way to send email from Smartsheet with Volanea is not a native plug-in installation. It is a secure event pipeline: Smartsheet emits a row.created or carefully filtered row.updated event, your relay fetches the row through the Smartsheet API, and Volanea receives a validated email request from server-side code.

That extra relay provides the controls that production email needs: protected API keys, deterministic field mapping, fast webhook acknowledgement, duplicate protection, validation, and useful audit records. Build around the fact that the webhook delivers IDs rather than the whole row, and the integration will remain dependable as the sheet and workflow evolve.

FAQ

Can Smartsheet send directly to the Volanea API?

Not through a native Volanea Smartsheet app or by pointing a Smartsheet webhook directly at the email API. A webhook callback needs a server-side relay to fetch row data, build the email payload, and keep the Volanea API key private.

What Smartsheet event should start the email?

Use row.created for an immediate acknowledgement after a new row or form submission. Use row.updated only when you need a controlled workflow change, such as Stage becoming Approved, and add idempotency so later edits do not resend mail.

Does the Smartsheet webhook include the recipient email address?

No. A row event identifies the relevant sheet and row. Your service should call the Smartsheet row API, then map the row’s cell values to the Volanea email request.

Where should the Volanea API key be stored?

Store it in the server-side relay’s secret manager or encrypted environment configuration. Never store it in a Smartsheet cell, form, client-side script, callback URL, or other client-visible setting.

How do I prevent duplicate emails after webhook retries?

Persist Smartsheet’s event ID and a business-level send key such as rowId:message-type before retrying work. Acknowledge webhooks quickly, process through a durable queue, and send only when no successful record exists for that event or message type.

How to Send Email From Smartsheet With Volanea