How to Send Email from CallTrackingMetrics with Volanea

CallTrackingMetrics email integration is most reliable when CallTrackingMetrics handles the event and Volanea handles the email, with a small server-side endpoint translating one payload into the other. That endpoint is important: it protects your sending key, validates recipient data, and prevents a webhook retry from becoming a duplicate follow-up.

CallTrackingMetrics does not have a native Volanea marketplace app or one-click connector. It does, however, support webhooks that POST activity data to a callback URL after selected activity-based triggers occur. That makes a direct event-driven integration practical without polling CTM or exporting call records on a schedule.

This guide uses the CTM trigger named “At the end of a call/form/chat, once all data has been captured.” It is a strong default for follow-up email because attribution, contact updates, and other post-activity data have had a chance to attach to the activity record before your email workflow runs.

What this CallTrackingMetrics email integration does

The integration has three parts:

1. CallTrackingMetrics creates or completes an activity. This may be a phone call, a FormReactor form submission, or a chat activity.
2. A CTM webhook POSTs the activity data to your server endpoint. CTM calls this a callback URL.
3. Your endpoint maps the activity to a Volanea send request. It validates the email address, constructs the message, and calls POST https://api.volanea.com/v1/send with a stable Idempotency-Key.

The flow looks like this:

Call/form/chat activity completes in CallTrackingMetrics
  → CTM webhook posts activity data to your HTTPS endpoint
  → endpoint validates the event and recipient
  → endpoint creates a deterministic idempotency key
  → Volanea POST /v1/send accepts one transactional message
  → delivery, bounce, complaint, and suppression handling stay in Volanea

The purpose is not merely to send an email after every call. It is to send the right message after the right completed activity. A missed call may deserve an immediate “Sorry we missed you” message. A qualified inbound call might trigger a recap and booking link. A FormReactor submission might send a confirmation, while a low-quality or spam-marked activity should send nothing at all.

Because CTM’s webhooks send activity data rather than a purpose-built email payload, the adapter is where you make those operational decisions explicit.

Choose the right CallTrackingMetrics trigger

CTM has workflow and automation triggers for call, text, form, and chat activity. The documented trigger list includes “At the end of a call/form/chat, once all data has been captured,” along with earlier lifecycle options such as receiving a call or text, agent connection, contact-panel updates, and transcription readiness.

For most transactional follow-up, use the completed-data trigger rather than a start-of-call trigger.

Why completed activity is usually the best email event

At the beginning of a call, CTM may know the caller number and tracking number, but it may not yet have final duration, disposition, tags, custom-field edits, attribution, or a completed contact update. An email sent at that point is often too early to personalize safely.

At the end of the activity, your handler can use data that was collected during the interaction. That gives you a useful decision point:

• Send a missed-call acknowledgement only when the call was not answered.
• Send a lead follow-up only when the activity has a usable email field.
• Skip messages for a do-not-contact tag or an internal test tracking number.
• Use a campaign or tracking-source value to select a different template.
• Wait for “When transcription is ready” only when the content of a transcript is genuinely required for the next step.

Do not use transcription readiness merely because it sounds more complete. It adds latency, and transcripts can introduce privacy, consent, and message-quality risks. Most customer acknowledgements should be based on structured activity fields, not copied call content.

Configure the CTM webhook

In CallTrackingMetrics, create a webhook in the account’s webhook or automation configuration and set its callback URL to an HTTPS endpoint you control, such as:

https://integrations.example.com/webhooks/calltrackingmetrics

For an agency-wide configuration, CTM’s Global Automation documentation places this area under Flows → Global Automation and describes webhooks as a separate global automation feature. Global Automation is intended for a rule applied across multiple sub-accounts; CTM notes that Global Automation requires a Sales Engage or Connect plan.

Set the trigger to:

At the end of a call/form/chat, once all data has been captured

Then add rules before the webhook where possible. For example, only fire when the tracking source is a paid-lead campaign, a selected tracking number is involved, or a qualifying tag exists. Filtering in CTM reduces unnecessary webhook deliveries, but your endpoint must still enforce the same critical conditions because webhook payloads are external input.

Understand the CallTrackingMetrics webhook payload

CTM’s webhook feature posts activity data to the callback URL after the configured criteria are met. The exact payload varies by activity type, enabled features, account configuration, and custom fields. Do not assume that a field appearing for phone calls will also appear for FormReactor forms or chats.

CTM’s webhook documentation specifically describes field-oriented activity mapping and gives examples including caller_number, source, and custom fields named with a custom_ prefix such as custom_account_number. That naming convention is useful when you create a dedicated email capture field.

For this integration, create or standardize a CTM custom activity/contact field named lead_email. The webhook field is then expected as custom_lead_email, following CTM’s documented custom-field pattern. Test this in your account before enabling production sends.

Here is the practical payload shape your handler should be prepared to receive. The fields shown are activity data, with caller_number, source, and the custom_ convention aligned with CTM’s webhook field documentation. The optional fields must be treated as optional in code.

{
  "id": 987654321,
  "caller_number": "+14155550123",
  "tracking_number": "+14155550999",
  "source": "Google Ads",
  "custom_lead_email": "alex@example.com",
  "custom_first_name": "Alex",
  "custom_last_name": "Morgan"
}

Do not build your production handler around an untested sample alone. CTM’s webhook test action sends the most recent activity in the activity log, so use it to capture the actual request body for each activity type you intend to automate. Save a redacted fixture for calls, forms, and chats, then use those fixtures in automated tests.

Field mapping for email follow-up

A simple mapping might look like this:

The recipient address should come from an email field, not from a guessed email address derived from a phone number or a CTM user account. If no validated email exists, return a successful webhook acknowledgement after recording a structured skipped_no_recipient result. A missing recipient is a business-rule skip, not an infrastructure failure worth repeatedly retrying.

Build a secure webhook-to-Volanea adapter

It is technically possible for some webhook products to store custom request headers, but the recommended architecture is still CTM → your endpoint → Volanea. CTM sends activity data in its own schema; Volanea expects an email request schema. A middleware endpoint is the safe place to transform one into the other.

This also answers the key-management question clearly: the Volanea secret API key should not live in CallTrackingMetrics. Keep it in the server-side environment or secret manager used by your webhook endpoint, for example as VOLANEA_API_KEY.

CTM Global Automation does support adding custom request headers to requests. Use that capability, if available to your account, for a separate webhook authentication secret such as X-CTM-Webhook-Secret. That secret lets your endpoint reject unauthenticated requests. It is not a substitute for protecting the Volanea key.

Never put a Volanea secret key in:

• Browser JavaScript, a CTM tracking-code snippet, or a public landing page.
• A client-visible form configuration.
• A query string, where it can leak through logs and referrer headers.
• A shared spreadsheet, ticket, or plain-text deployment note.
• A webhook callback URL that might be copied into integrations, logs, or screenshots.

If a Volanea key is exposed, rotate it promptly and update the server-side secret. For key setup, sending fields, and the full endpoint reference, use the Volanea email API documentation.

Working Node.js example

The following Express endpoint accepts a CTM activity payload, verifies a webhook secret, maps CTM fields into a Volanea email request, and uses the CTM activity ID to create a stable idempotency key.

import express from "express";

const app = express();
app.use(express.json({ limit: "1mb" }));

const {
  CTM_WEBHOOK_SECRET,
  VOLANEA_API_KEY,
  VOLANEA_FROM_EMAIL,
  VOLANEA_FROM_NAME = "Acme Team"
} = process.env;

function escapeHtml(value = "") {
  return String(value)
    .replace(/&/g, "&")
    .replace(/</g, "&lt;")
    .replace(/>/g, "&gt;")
    .replace(/"/g, "&quot;")
    .replace(/'/g, "&#039;");
}

function isValidEmail(value) {
  return /^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(String(value || ""));
}

app.post("/webhooks/calltrackingmetrics", async (req, res) => {
  // Store a separate shared secret in CTM custom request headers.
  // Do not store VOLANEA_API_KEY in CallTrackingMetrics.
  if (req.get("X-CTM-Webhook-Secret") !== CTM_WEBHOOK_SECRET) {
    return res.status(401).json({ error: "unauthorized" });
  }

  const activity = req.body;

  // CTM activity mapping:
  // custom_lead_email  → Volanea to
  // custom_first_name  → email greeting
  // caller_number      → email context
  // source             → email context
  // id                 → stable duplicate-prevention key
  const activityId = String(activity.id || "");
  const recipient = String(activity.custom_lead_email || "").trim().toLowerCase();
  const firstName = String(activity.custom_first_name || "there").trim();
  const callerNumber = String(activity.caller_number || "not available").trim();
  const source = String(activity.source || "your recent enquiry").trim();

  // A normal skip should receive 2xx so CTM does not retry it.
  if (!activityId || !isValidEmail(recipient)) {
    console.info("ctm_email_skipped", {
      activityId: activity.id || null,
      reason: "missing_or_invalid_custom_lead_email"
    });
    return res.status(202).json({ status: "skipped_no_valid_recipient" });
  }

  const subject = "Thanks for contacting Acme";
  const safeName = escapeHtml(firstName);
  const safeSource = escapeHtml(source);
  const safeCallerNumber = escapeHtml(callerNumber);

  const emailPayload = {
    from: `${VOLANEA_FROM_NAME} <${VOLANEA_FROM_EMAIL}>`,
    to: [recipient],
    subject,
    text: `Hi ${firstName},\n\nThanks for contacting Acme through ${source}. We received your enquiry from ${callerNumber} and will be in touch shortly.\n\nAcme Team`,
    html: `<p>Hi ${safeName},</p><p>Thanks for contacting Acme through ${safeSource}. We received your enquiry from ${safeCallerNumber} and will be in touch shortly.</p><p>Acme Team</p>`
  };

  // The same CTM activity must always use the same key. If CTM retries
  // delivery after a timeout, Volanea can safely recognize the repeated send.
  const idempotencyKey = `ctm-activity-${activityId}-follow-up-v1`;

  const volaneaResponse = await fetch("https://api.volanea.com/v1/send", {
    method: "POST",
    headers: {
      "Authorization": `Bearer ${VOLANEA_API_KEY}`,
      "Content-Type": "application/json",
      "Idempotency-Key": idempotencyKey
    },
    body: JSON.stringify(emailPayload)
  });

  const responseBody = await volaneaResponse.text();

  if (!volaneaResponse.ok) {
    console.error("volanea_send_failed", {
      activityId,
      status: volaneaResponse.status,
      responseBody
    });

    // A 5xx or network failure should be retried by your own queue or CTM,
    // always with the same idempotency key. Do not retry 4xx blindly.
    return res.status(502).json({ error: "email_provider_request_failed" });
  }

  console.info("ctm_email_accepted", {
    activityId,
    recipient,
    idempotencyKey
  });

  return res.status(202).json({ status: "accepted" });
});

app.listen(3000, () => {
  console.log("CTM webhook adapter listening on port 3000");
});

The API call uses Volanea’s REST base URL, POST /v1/send, Bearer secret-key authorization, and the Idempotency-Key header supported by the send endpoint. Volanea can send one recipient or up to 50 recipients in a single send request, but a one-activity-to-one-recipient design is easier to reason about for automated call follow-up.

Use a real email field, not a guessed recipient

The biggest operational issue in a CallTrackingMetrics email integration is often not email API syntax. It is identifying the recipient responsibly.

A caller phone number does not give you permission to email the caller, and it cannot be reliably converted into an email address. Likewise, a form activity can have a name and phone number but no email. Your handler must distinguish “an activity happened” from “we have a valid and appropriate address for a transactional message.”

A good recipient-data policy

Use a documented field contract for every source that can create a CTM activity:

• Phone call: Email only when an agent or connected workflow populated the approved email field.
• FormReactor form: Map the form’s email input into lead_email and verify it appears in the CTM activity webhook payload.
• Chat: Send only if the chat form collects an email field and your notice/consent policy permits the follow-up.
• Manual activity edits: Decide whether updating custom_lead_email after the activity ends should create a new event. Usually it should not; send through a deliberate follow-up workflow instead.

Use a descriptive field name, such as lead_email, instead of a generic unlabeled custom field. It makes webhook mapping, testing, audit trails, and staff training substantially easier.

Before sending high-value messages, you can also verify recipient quality with the email address verification tool. Verification is useful for catching malformed or risky addresses, but it does not establish consent or override an unsubscribe preference.

Personalize without putting sensitive call data into email

A completed CTM activity can include valuable attribution and interaction data. That does not mean all of it belongs in a customer email.

A safe customer message might say that the team received an enquiry and will respond shortly. It generally should not include an unredacted call transcript, internal lead score, agent notes, payment details, health details, full tracking attribution, or a recording URL.

Keep internal notifications separate

Customer follow-up and internal alerts are different workflows.

For a customer email, use only the data needed to acknowledge the interaction and explain the next step. For an internal email to a sales or service team, include an activity ID, campaign source, tracking number, and a secure link to the CTM record if your organization’s access model allows it.

This distinction matters especially for regulated industries. CTM’s HIPAA guidance warns users to avoid moving protected health information out of CallTrackingMetrics into email or text. If your process could involve sensitive information, design the email as a generic notification that directs authorized staff to the protected system rather than repeating activity content in the message.

Prefer templates as the program grows

Inline HTML is clear for an initial integration because every field mapping is visible in one place. Once you have several campaigns, languages, brands, or follow-up types, move message copy into managed templates and keep the adapter focused on selecting the correct template and providing safe variables.

That separation has practical benefits:

• Marketing or operations teams can update approved copy without editing webhook code.
• You can make a missed-call confirmation distinct from a consultation-request confirmation.
• Translation and brand reviews are easier to manage.
• Your code has fewer places where HTML escaping mistakes can occur.

Do not let template flexibility weaken the event contract. Each template should specify the required and optional variables, a default value for missing optional fields, and the sending domain it is permitted to use.

When this breaks

Webhook integrations fail at boundaries: CTM’s event delivery, your endpoint, recipient field collection, and Volanea’s send request. Design the response to each failure class rather than treating every non-200 result as the same problem.

CTM retries can create duplicate-send risk

A webhook sender can retry when it does not receive a successful response, including when your server processes the request but the connection closes before CTM receives the response. If every inbound webhook generates a fresh email request, a single completed call can produce multiple emails.

The code avoids this by deriving the Volanea Idempotency-Key from the CTM activity ID and message purpose:

ctm-activity-987654321-follow-up-v1

Keep that key stable for retries of the same intended message. Do not generate a random UUID each time the CTM webhook arrives; that would tell Volanea that each retry is a new email.

For stronger protection, also persist processed activity IDs in a database with a status such as received, sending, accepted, skipped, or failed_retryable. Database-level tracking protects you when the same activity reaches more than one process, when you change providers, or when a team member accidentally creates overlapping CTM automation rules.

Webhook timeouts can make success ambiguous

A timeout does not prove that the Volanea request failed. Your adapter may have sent the email successfully but failed to return its acknowledgement in time. This is why the endpoint should do only essential synchronous work: authenticate the request, validate the payload, record the activity ID, enqueue the job if you use a queue, and return a 2xx response.

For higher volume, use this pattern:

1. Receive the CTM webhook.
2. Validate the shared webhook secret and basic payload shape.
3. Store the raw payload and deterministic event key.
4. Add a send job to a durable queue.
5. Return 202 Accepted quickly.
6. Have a worker call Volanea using the stable idempotency key.

This keeps a slow email-provider response, a database hiccup, or a temporary downstream incident from occupying the CTM webhook connection longer than necessary.

Payload fields can be absent across CTM activity types or plans

A phone-call activity, a FormReactor activity, and a chat activity do not necessarily contain identical fields. Fields can also be absent when the related CTM feature is not enabled, a contact field was never captured, or a user’s plan/account configuration does not expose the expected data.

Treat fields such as custom_lead_email, source, attribution data, call outcome, transcription-related fields, and custom fields as nullable unless you have tested the exact trigger and activity source in your account.

The safe behavior is:

• Missing recipient email: acknowledge and skip.
• Missing personalization field: use a harmless fallback such as “there.”
• Missing field required for eligibility: skip and log a structured reason.
• Missing field needed for a business workflow: alert the integration owner; do not manufacture a value.

A structured log should include the CTM activity ID, trigger name or integration version, skip/failure reason, and a redacted field inventory. Avoid logging full email bodies, sensitive custom fields, recordings, or transcripts.

Authentication failures need a different response from data failures

Return 401 or 403 for a missing or invalid webhook secret. That is an endpoint-security problem. Return 202 for a well-authenticated event that is intentionally skipped because it lacks an approved recipient. Return a retryable server error only for temporary failures you genuinely want CTM or your queue to retry.

This status-code discipline prevents two costly mistakes: silently accepting unauthorized traffic, and repeatedly retrying events that will never have a valid email address.

Volanea rejections should be inspected, not blindly replayed

A 4xx response commonly means the request needs correction: an invalid sender, malformed recipient, an unverified domain, a policy restriction, or a bad request body. Retrying the exact request will not fix it.

A 5xx, network failure, or timeout is a different class. Retry it with the same idempotency key and the same request body. If the first request was accepted but its response was lost, the stable key allows Volanea to prevent a second send.

Test the complete path before enabling live follow-up

A webhook configuration can look correct while one field name, one header, or one activity source is wrong. Run a focused test plan before connecting the workflow to real lead traffic.

Minimum test checklist

1. Create a CTM test activity with a valid lead_email value.
2. Use CTM’s webhook test capability and capture the exact incoming request in a secure development environment.
3. Confirm the endpoint receives the expected X-CTM-Webhook-Secret header.
4. Confirm the handler maps custom_lead_email to the Volanea to field.
5. Confirm the authenticated sender in from uses a domain configured in Volanea.
6. Send the same CTM fixture twice and verify only one logical email is accepted because the idempotency key is unchanged.
7. Remove the email field and verify the endpoint returns a skip response rather than attempting a send.
8. Test a non-2xx Volanea response and ensure logs contain the activity ID and safe diagnostic context.
9. Test a FormReactor activity separately from a call activity.
10. Review the delivered email on desktop and mobile, including reply handling and unsubscribe behavior where applicable.

Create dedicated test tracking numbers and a test sender domain when possible. That makes it easier to distinguish integration testing from normal production lead flow and prevents accidental messages to real prospects.

Operational choices that improve deliverability

A CallTrackingMetrics-triggered message is usually transactional or operational: an acknowledgement, appointment follow-up, request confirmation, or missed-call response. Its sender identity and content should reflect that purpose.

Use a recognizable From name, an authenticated sending domain, and reply handling that goes to a monitored inbox or a deliberately configured support route. A message that promises a response but sends replies into an unmonitored mailbox creates a worse customer experience than no automatic email.

Keep the first automated message concise. A long marketing sequence attached to a call event can create complaints, especially when the caller did not knowingly provide an email address for marketing. Separate immediate service follow-up from promotional nurture workflows, and make the event-to-message rule easy for a compliance reviewer to understand.

Measure the full chain, not only Volanea acceptance. Useful metrics include completed CTM activities, webhook deliveries, valid-recipient rate, skipped-no-recipient rate, Volanea acceptance rate, bounce rate, complaint rate, reply rate, and time from activity completion to email acceptance. A sudden drop in valid-recipient rate often indicates a CTM custom-field mapping change, not an email-provider problem.

Conclusion

A reliable CallTrackingMetrics email integration does not require a native plugin. CTM webhooks can deliver completed activity data to your application, and Volanea can send the resulting transactional email through one REST API call.

The key design choice is the middleware adapter. It keeps the Volanea API key outside CTM and out of client-visible code, translates CTM activity fields into an email payload, handles missing fields safely, and uses the CTM activity ID as the basis for idempotent sending. Start with the completed call/form/chat trigger, test the real payloads from your own account, and treat every automated message as a deliberate workflow—not a side effect of receiving a webhook.

FAQ

Does CallTrackingMetrics have a native Volanea integration?

No. This setup uses CallTrackingMetrics webhooks and a server-side adapter that calls the Volanea REST API. There is no native CallTrackingMetrics marketplace installation flow for Volanea.

What CallTrackingMetrics trigger should send the email?

For most follow-up messages, use “At the end of a call/form/chat, once all data has been captured.” It gives CTM time to attach final activity data before your webhook runs.

Where should I store the Volanea API key?

Store it only in the environment variables or secret manager of your server-side webhook endpoint. Do not place it in CTM browser-facing code, forms, callback URLs, or client-visible configuration. If you use a CTM custom webhook header, use it for a separate endpoint-verification secret.

How do I stop duplicate emails when CTM retries a webhook?

Create a deterministic Volanea Idempotency-Key from the CTM activity ID and message type, such as ctm-activity-987654321-follow-up-v1. Reuse that same key for every retry of the same logical email.

Can I send email after a FormReactor submission?

Yes, if the FormReactor submission creates a CTM activity and your configured webhook trigger includes completed form activity. Map the form’s email input into a tested CTM field such as custom_lead_email, then send only when that field contains a valid address.