How to Send Email from Hightouch with Volanea

Send email from Hightouch when a customer record becomes eligible for a message in your warehouse—not when someone manually exports a list. With Hightouch’s HTTP Request destination and Volanea’s REST API, a data model can trigger an email whenever Hightouch detects a newly added row, while keeping the sending credential on the server-side integration.

This is a direct HTTP integration, not a native Hightouch marketplace app. You configure Hightouch to make an authenticated POST request to Volanea’s email API, map fields from your Hightouch model into the email payload, and use a stable idempotency key so a retry does not become a duplicate email.

What this Hightouch-to-Volanea integration does

Hightouch is designed to activate modeled data from a warehouse or other connected source. Its HTTP Request destination is the flexible option for a service that does not have a purpose-built destination. It lets you define the destination base URL and reusable headers, then configure an HTTP request for the row events that should cause an outbound action.

For this integration, the outbound action is a Volanea send request:

• Trigger: Hightouch detects a row added to the model result.
• Action: Hightouch makes a POST request to Volanea.
• Recipient: The new row’s email column becomes the message recipient.
• Content: Other model columns populate the subject and the HTML and text bodies, or values for a stored Volanea template.
• Authentication: Hightouch sends the Volanea API key in a destination header marked as secret.
• Duplicate protection: A stable row-level identifier is sent as the Volanea Idempotency-Key header.

This approach is well suited to data-driven operational messages, including trial-start confirmations, approved account notices, onboarding invites, renewal alerts, and notifications that become valid only after data is written to the warehouse.

It is not automatically appropriate for every email. Password resets, login codes, immediate order receipts, and other latency-sensitive messages should normally originate from the application that owns the user action. A warehouse activation pipeline has query, synchronization, and scheduling latency by design. Use it when the warehouse is the authoritative source of the business condition that should cause the email.

The real trigger: Rows added in a Hightouch sync

The concrete trigger in this setup is Rows added. Hightouch queries the source behind your model and compares current results with the prior sync state. For an HTTP Request destination, you can configure different outbound requests for added, changed, and removed rows. Here, configure only the request for newly added rows.

That detail matters. “A user exists in the source table” is not itself a one-time email event. If you build a model containing every active customer and use a broad sync behavior, you can accidentally request a send for a large historical population. Your model and primary key determine what Hightouch recognizes as a new record.

Design the model around a sendable business event

Create a Hightouch model that returns one row for one logical email event. Do not make the email address the primary key unless a person can receive only one instance of that email forever. An address can legitimately receive several different messages over time.

A useful model includes a durable event identifier plus every field required to render the message. For example:

SELECT
  CONCAT('trial-start:', t.id) AS email_event_id,
  c.id AS customer_id,
  c.email,
  c.first_name,
  t.plan_name,
  t.started_at,
  t.ends_at,
  CONCAT('https://app.example.com/billing') AS billing_url,
  'Welcome to your trial' AS email_subject
FROM trials t
JOIN customers c ON c.id = t.customer_id
WHERE t.started_at >= CURRENT_TIMESTAMP - INTERVAL '1 day'
  AND c.email IS NOT NULL
  AND c.marketing_opt_out = FALSE;

Set email_event_id as the model’s primary key. The example uses a deterministic event identifier rather than a random value generated on every query. If the same trial row appears again on a later run, Hightouch can recognize that it is not a newly added row. If a distinct trial begins later, it receives a distinct event ID and can trigger another email.

The exact SQL syntax depends on your warehouse. The underlying design does not: expose a stable primary key, a validated recipient address, and all the message-specific values you intend to use.

Why Rows added is usually safer than Rows changed

A row changed trigger can be useful for notifications such as “your application moved to approved” or “your account is now ready.” But it is only safe when the model itself represents a one-time transition.

For example, if your model returns every customer whose lifecycle_stage = 'approved', then a later unrelated update—such as a phone-number change—may change the model row and make it eligible for another HTTP request. Instead, model a dedicated event record, include a state-transition timestamp, or generate a deterministic identifier that represents the approval event itself.

The simplest initial configuration is:

1. Build a model with one row per message intent.
2. Choose a stable event ID as its primary key.
3. Configure the HTTP Request sync to send only when Rows added.
4. Start with a narrow test cohort.
5. Inspect the first sync run before expanding the model.

This gives you a clear answer to the operational question: which data change created the email request?

Prerequisites before you configure the destination

Before setting up Hightouch, complete the email-side prerequisites in Volanea. You need a Volanea API key and a sender address on a verified sending domain. A request that names an unverified sender domain should be treated as a configuration failure, not something to work around by substituting a personal mailbox.

You also need to decide whether the Hightouch request will send inline content or invoke a stored Volanea template.

Option 1: Send inline content

Inline content is easiest to understand during initial testing. Hightouch maps model columns into subject, html, and text fields in the JSON request. This works well when the content is short, operational, and strongly tied to the data model.

The tradeoff is ownership. Editing the email requires changing the Hightouch request configuration, and HTML stored inside a data-activation workflow can become difficult to review. Use it for simple notices or when the exact message is generated by the model.

Option 2: Send a stored Volanea template

For messages with shared branding, localization, or repeated layouts, use a Volanea template addressed by templateId. The Hightouch payload supplies the recipient and template variables rather than carrying a full HTML document on each call.

Templates reduce duplicated markup and separate content changes from activation logic. They are usually the better production option for welcome emails, invitations, renewal notices, and messages that will be revised by more than one team. Review the email API reference and setup guides before standardizing a template payload, especially if you need attachments, scheduling, or event callbacks.

Configure the Hightouch HTTP Request destination

In Hightouch, go to the destination setup flow and add an HTTP Request destination. The destination stores connection-level settings; the sync stores the row-trigger behavior, endpoint path, request body, rate controls, and error-handling choices.

Use the following destination-level configuration:

Hightouch lets you add HTTP headers to this destination and mark sensitive header values as secret. Use that capability for the Volanea credential. Do not put the API key in a model column, a request-body field, a frontend environment variable, a public form configuration, or a URL query string.

Why the API key belongs in a secret destination header

A Volanea API key authorizes email sending. Anyone who gets that key can potentially submit email requests under your account until the key is revoked. It is not a publishable browser token.

The HTTP Request destination runs from Hightouch’s service-side sync infrastructure. Storing the Authorization header there keeps the key out of the model payload and out of client-visible code. Marking the value as secret also avoids treating it like an ordinary configuration field in the Hightouch UI.

Limit access to the destination configuration to people who genuinely need to maintain it. Rotate the key if it is ever copied into a ticket, commit, browser application, analytics tool, or other system that should not retain sending credentials.

Configure the row-added request

Attach the HTTP Request destination to the model. In the sync configuration, enable the trigger for Rows added. Configure this specific request:

Use one request per row for a transactional-email workflow. A row-level request makes each message independently observable in the Hightouch debugger and gives every logical email its own idempotency key. It also makes a rejected address easier to diagnose than a mixed batch response.

Set a reasonable concurrency and rate limit based on the message type and the capacity you want to reserve for this flow. A low initial ceiling is sensible during rollout. Then increase it after you have verified that the primary key, recipient mapping, and duplicate controls behave as expected.

The actual payload Hightouch should send

The HTTP Request destination does not impose one fixed webhook payload for all customers. You define the outgoing request body from the selected model columns. That is a strength, but it also means you must inspect the resulting JSON rather than assume Hightouch will automatically transform a warehouse row into an email request.

For the trial-start model above, configure the Hightouch request body so each row produces this concrete JSON shape:

{
  "from": "Acme Billing <billing@updates.example.com>",
  "to": "{{ email }}",
  "subject": "{{ email_subject }}",
  "html": "<p>Hi {{ first_name }},</p><p>Your {{ plan_name }} trial is active until {{ ends_at }}.</p><p><a href=\"{{ billing_url }}\">Manage billing</a></p>",
  "text": "Hi {{ first_name }},\n\nYour {{ plan_name }} trial is active until {{ ends_at }}.\n\nManage billing: {{ billing_url }}"
}

The {{ ... }} values above represent the field values that you select and insert with Hightouch’s JSON template builder. The important outcome is the rendered request, not the visual representation of a field token in the editor. Hightouch should ultimately send Volanea valid JSON like this for one model row:

{
  "from": "Acme Billing <billing@updates.example.com>",
  "to": "lee@example.net",
  "subject": "Welcome to your trial",
  "html": "<p>Hi Lee,</p><p>Your Growth trial is active until 2026-11-04.</p><p><a href=\"https://app.example.com/billing\">Manage billing</a></p>",
  "text": "Hi Lee,\n\nYour Growth trial is active until 2026-11-04.\n\nManage billing: https://app.example.com/billing"
}

The header should be rendered separately as:

Authorization: Bearer YOUR_VOLANEA_API_KEY
Content-Type: application/json
Idempotency-Key: trial-start:847291

Do not use an idempotency key that changes every sync, such as a current timestamp or random UUID created at request time. Volanea cannot identify a retry as the same logical email if the retry carries a different key.

The Volanea REST API call, with field mapping

The integration results in an HTTP call to POST https://api.volanea.com/v1/send. The following cURL request shows exactly what Hightouch is meant to produce after resolving its row fields and destination secrets.

curl --request POST 'https://api.volanea.com/v1/send' \
  --header 'Authorization: Bearer YOUR_VOLANEA_API_KEY' \
  --header 'Content-Type: application/json' \
  --header 'Idempotency-Key: trial-start:847291' \
  --data '{
    "from": "Acme Billing <billing@updates.example.com>",
    "to": "lee@example.net",
    "subject": "Welcome to your trial",
    "html": "<p>Hi Lee,</p><p>Your Growth trial is active until 2026-11-04.</p><p><a href=\"https://app.example.com/billing\">Manage billing</a></p>",
    "text": "Hi Lee,\n\nYour Growth trial is active until 2026-11-04.\n\nManage billing: https://app.example.com/billing"
  }'

Here is the complete field mapping to implement in the Hightouch sync:

Keep both html and text in the request. The HTML version supplies the designed message, while the text version provides a useful alternative for clients that do not display HTML well or for recipients who prefer plain text.

A template-based payload alternative

If you have a Volanea template named trial-start-v1, map values into the template variables instead of assembling the content in Hightouch. The request becomes smaller and more maintainable:

{
  "from": "Acme Billing <billing@updates.example.com>",
  "to": "lee@example.net",
  "templateId": "trial-start-v1",
  "variables": {
    "firstName": "Lee",
    "planName": "Growth",
    "endsAt": "2026-11-04",
    "billingUrl": "https://app.example.com/billing"
  }
}

In that version, the Hightouch mapping is still explicit: first_name becomes variables.firstName, plan_name becomes variables.planName, and so on. Keep the field names aligned with the variables your Volanea template expects. A mismatch is not merely cosmetic; it can produce incomplete or misleading customer communications.

Validate before sending production mail

Treat the first sync as an integration test, not as a campaign launch. Restrict the source model to a test recipient or an internal test cohort, run the sync manually, and verify every layer.

Check the source row first

Confirm that the model returns:

• One stable email_event_id per intended message.
• A syntactically valid recipient address.
• A recipient you are authorized to contact for this message category.
• No missing variable required by the body or template.
• A sender address on an authenticated Volanea domain.

If email addresses originate from user-entered data, validate them before they become eligible for automated sends. The free email address verification tool can help check a single address, but production workflows should still have a clear source-of-truth policy for consent, account state, and address changes.

Inspect the Hightouch request and response

Hightouch’s sync debugger lets you inspect request and response details for individual rows. Use it to compare the rendered payload with the expected payload shown above.

Look specifically for these common mapping errors:

1. An unresolved field token appears literally in the body.
2. The recipient field is empty, null, or mapped from the wrong column.
3. JSON becomes invalid because a dynamic value contains quotation marks or line breaks and was inserted incorrectly.
4. The Idempotency-Key uses an email address or timestamp instead of the stable event identifier.
5. The from address is different from the one whose domain was verified.

A successful HTTP response means Volanea accepted the API request. It is not the same thing as a confirmed inbox placement. Delivery may later be affected by recipient suppression status, mailbox provider handling, recipient rules, or other post-acceptance events. Monitor delivery events and investigate any unexpected skips, bounces, or complaints.

When this breaks: failures specific to this hop

An HTTP integration crosses two systems: Hightouch decides a model row should result in a request, and Volanea accepts the email request. Most failures become easier to resolve when you identify which part of that hop failed.

Hightouch retries and duplicate email risk

Retries are normal in distributed systems. A request can reach Volanea successfully while the response is delayed or lost before Hightouch receives it. Hightouch may then treat the operation as unsuccessful and retry it. Without duplicate protection, the recipient can receive two logically identical emails.

Use the same Idempotency-Key for every retry of the same message intent. In this guide, trial-start:847291 is tied to the durable email_event_id, so all reattempts of that row represent the same send. Do not generate a new key for every attempt.

Also distinguish between two kinds of duplicates:

• Transport duplicates: Hightouch retries an uncertain or failed request. The idempotency key addresses these.
• Data-model duplicates: Your model creates multiple distinct rows for the same business event. The API sees different idempotency keys and rightly treats them as different requests.

If recipients get duplicate messages despite stable headers, inspect the model first. A join that multiplies trial rows, a primary-key change, or a broad Rows changed trigger often explains the issue.

Webhook or HTTP timeouts

A timeout does not prove the request failed. It proves the caller did not receive a timely response. The message may have been accepted before the timeout, which is why a stable idempotency key is required.

For this direct integration, avoid placing a slow middleware service between Hightouch and Volanea unless it provides a real benefit such as policy enforcement, content generation, or centralized event storage. If you do use middleware, it should acknowledge Hightouch quickly after validating and durably recording the message intent. It can process the Volanea request asynchronously afterward.

When a timeout occurs:

1. Check the Hightouch row-level debugger for the request outcome.
2. Search Volanea activity using the time window and recipient details.
3. Do not manually rerun the row with a new idempotency key until you know whether the original request was accepted.
4. If you retry intentionally, preserve the original key.

Payload fields missing, empty, or unavailable

Hightouch sends only the values that your model produces and that your request template references. A field can be absent or empty for several reasons: the warehouse query returns null, a source connector lacks the property, permissions prevent extraction, a selected source plan does not expose the desired field, or a model revision removed or renamed the column.

Do not let missing fields silently produce low-quality messages. In the source model, explicitly filter out records without required fields or provide a safe fallback. For example, do not render Hi , because first_name was null; either use a fallback greeting in SQL or exclude that row until data is complete.

For required values such as email, email_event_id, plan_name, and an authorization-sensitive URL, fail the row rather than inventing a default. A failed row is observable and fixable. A misleading email is much harder to undo.

Authentication failures

A 401 or 403 response generally points to a bad, revoked, expired, malformed, or insufficiently authorized credential, or to a sender/domain configuration issue. Confirm that the destination header begins with Bearer and that the secret itself contains only the Volanea API key—not quotes, an environment-variable expression, or a copied prefix from another provider.

Never troubleshoot this by moving the key into the model or body so it is easier to view in a debugger. Rotate the key if it was exposed, update the destination’s secret header, and rerun a test row.

Rate limits and runaway models

Hightouch gives HTTP Request destinations controls for rate limiting and concurrency. Use them. A SQL mistake can turn one expected row into thousands of new rows, and every row-added trigger can become an outbound email call.

Add practical guardrails:

• Test the model with a hard cohort filter before scheduling it.
• Review row counts on the first runs.
• Use a low initial request rate.
• Alert on unusual increases in operations or rejected rows.
• Keep a kill-switch condition in the model, such as an email_enabled control flag.

The goal is not to eliminate automation. It is to make the blast radius of a bad query small enough to manage.

Operational design choices that improve reliability

A working HTTP request is only the starting point. The quality of this integration depends on how you model business events and how you operate the send path after launch.

Keep transactional and marketing logic separate

A trial-start confirmation is normally transactional or operational: it acknowledges an account state the recipient initiated or expects. A product newsletter or promotional offer is marketing. These categories can have different consent requirements, unsubscribe behavior, sender identities, and internal ownership.

Do not use this integration to bypass customer preferences. Model the eligibility condition directly in your source query, including consent and suppression-relevant conditions where appropriate. Then let Volanea apply its own sending safeguards as the request is processed.

Build for replay deliberately

At some point, you may need to replay a missed event after correcting a model bug. If your primary key and idempotency strategy are designed only for the happy path, replay becomes dangerous.

Define your replay policy before you need it. For example, an intentionally resent trial message could use a new business event ID such as trial-start-reissue:847291:2026-11-05, while a technical retry of the original message must retain trial-start:847291. Those are different decisions, and the identifier should make that difference explicit.

Version message content

If you use templates, add a version to the template identifier or your release process. If you use inline content, document the Hightouch sync revision and test it when changing data fields. Email copy is production behavior: an incorrect link, date calculation, or merge field can affect many recipients quickly.

Keep a small test dataset representing realistic edge cases:

• A name containing punctuation or non-ASCII characters.
• A missing optional first name.
• A long plan name.
• A URL with query parameters.
• A recipient who should be filtered out by eligibility rules.

Testing these cases catches JSON escaping and content issues that a single idealized test row will miss.

A practical launch checklist

Before enabling a production schedule, confirm the following:

1. Business event: The model represents one email-worthy event per row, not a broad customer snapshot.
2. Primary key: email_event_id is stable and unique for the intended message.
3. Trigger: Only Rows added is enabled unless you have explicitly designed for another row event.
4. Recipient policy: The query includes address, consent, and eligibility checks appropriate to the message.
5. Sender: The from address uses a verified Volanea sending domain.
6. Secret handling: The Volanea key is stored in Hightouch’s destination header and marked Secret.
7. Request body: The rendered JSON includes from, to, subject, html, and text, or a verified templateId with matching variables.
8. Idempotency: The header is deterministic and based on the logical email event, not on the sync attempt.
9. Testing: An internal test row was sent and inspected in both Hightouch and Volanea.
10. Observability: Owners know where to check sync errors, rejected rows, API failures, delivery events, and unusual send volume.

Conclusion

To send email from Hightouch with Volanea, use Hightouch’s HTTP Request destination—not a nonexistent native Hightouch app. Build a model that represents one sendable event, configure a Rows added trigger, map the row into a Volanea POST /v1/send request, and store the API key as a secret Authorization header in the destination.

The reliability detail that matters most is the stable Idempotency-Key. Hightouch can retry an HTTP request after a timeout or transient failure, and a retry must remain the same logical email rather than a second message. Pair that key with a durable event-oriented primary key, careful source filters, and row-level debugging, and the warehouse-to-email path becomes operationally safe as well as technically simple.

FAQ

Does Volanea have a native Hightouch destination?

No. This setup uses Hightouch’s HTTP Request destination to call Volanea’s REST API directly. There is no marketplace installation or native destination configuration to enable.

What starts the email in Hightouch?

This guide uses the HTTP Request destination’s Rows added trigger. Hightouch detects a newly added row in the model result and makes one outbound email request for that row.

Where should the Volanea API key be stored?

Store it in the Hightouch HTTP Request destination’s Authorization header and mark that header value as Secret. Do not store it in a warehouse column, request body, browser code, form configuration, or URL.

How do I prevent duplicate sends when Hightouch retries?

Set Volanea’s Idempotency-Key request header to a stable model field such as email_event_id. Reuse that exact value when the same logical message is retried.

Should I use inline HTML or a Volanea template?

Use inline HTML for simple, tightly data-driven notifications. Use a Volanea template for reusable layouts, centralized content changes, consistent branding, and messages with several personalization variables.