Sending & Testing

Send emails with n8n and MailBlastr

Use the MailBlastr HTTP Request node in n8n to send email, plus a webhook trigger node to start workflows on delivery, bounce, and other email events.

n8n is a workflow automation platform that connects apps and builds automations with little or no code. You can call MailBlastr from n8n with its built-in HTTP Request node to send email, and start workflows from MailBlastr webhook events with a Webhook trigger node — delivered, opened, bounced, and more.

Before you start

Create an API key and copy it — a sending_access key is enough to send.
Verify a domain so you can send to addresses other than your own.

Send an email from a workflow

Add an HTTP Request node and configure it to call POST ${BASE}/emails:

1
Add an HTTP Request node
On the canvas, add an HTTP Request node after your trigger.
2
Set method and URL
Method POST, URL https://api.mailblastr.com/emails.
3
Add authentication
Add a header Authorization with value Bearer mb_xxxxxxxxx (store the key in an n8n credential rather than inline).
4
Send JSON body
Set the body to JSON with from, to, subject, and html fields. Map values from earlier nodes with n8n expressions.
5
Execute
Run the node; a 200 response with an email id means it was accepted.

A minimal body for the node:

{
  "from": "Acme <hello@yourdomain.com>",
  "to": ["customer@example.com"],
  "subject": "Hello from n8n",
  "html": "<p>Sent from an n8n workflow.</p>"
}

Store the API key as an n8n Header Auth credential (header Authorization, value Bearer mb_xxxxxxxxx) and reference it from the node, so the key is not saved in the workflow JSON.

Trigger a workflow on email events

To start a workflow when something happens to your mail, add a Webhook trigger node, copy its URL, and register that URL as a webhook endpoint in MailBlastr — subscribing to the events you care about. Verify the signature (the svix-* headers and your whsec_ secret) before acting on a payload.

Events you can trigger on include:

Event	Fires when
`email.sent`	The email was accepted and sent.
`email.delivered`	The email was delivered to the recipient.
`email.bounced`	The email bounced.
`email.complained`	A spam complaint was received.
`email.opened`	The recipient opened the email.
`email.clicked`	A link in the email was clicked.
`email.received`	An inbound email was received (see Receiving).
`contact.created`	A new contact was added.

Example: welcome email on new contact

Webhook trigger — listens for contact.created.
HTTP Request — sends a welcome email to the new contact, mapping the address from the trigger payload.

The trigger-then-act pattern works for any event — notify Slack on a bounce, or log delivery events to a sheet. See the full emails API and webhooks overview.