Resend

The Resend integration lets your workflows send transactional emails, manage templates, contacts, domains and react to delivery events without custom code.

Authentication

Resend API Key (Required)

Generate an API key from your Resend dashboard and paste it into the Resend credential in Helios. This key authenticates every request sent to the Resend REST API.

OAuth flows are not supported by this integration.

Webhooks (Trigger only)

• After creating the integration, reopen it to enable webhooks.
• Copy the webhook URL generated by Helios.
• In your Resend dashboard (Settings → Webhooks) create a new webhook, paste the URL and pick the events you want to listen to (e.g. email.delivered).
• Copy the signing secret shown by Resend and paste it back into the Helios integration, then save.
• Add integration trigger to your workflow.

Once saved, matching Resend events will trigger your workflow in real time.

Permissions

The node can only perform the actions permitted by your Resend API key. Create a key with the required privileges (e.g. sending email, viewing templates) and add it to Helios. Any operation beyond those privileges will be rejected by Resend.

Functionality

As Trigger Node

Fire the workflow whenever Resend emits an event such as email.bounced or email.delivered. Combine with the natural-language filter prompt to target specific messages.

As Integration Node

Within a workflow you can perform any action exposed by the Resend REST API, including:

• Send single or batch emails
• Retrieve message status
• Manage templates
• Add or verify sender domains

See the Resend API reference for the full list of operations.

Outputs

The Resend node returns the full response from the Resend API. You can reference the output in other nodes using the [[nodes["resend"].output]] syntax in prompts.

Limitations

✅ What you can do

We support full range of operations from the Resend API. Read more about the endpoints and their capabilities in the Resend API reference. Some of the operations include:

• Send transactional emails
• Manage templates
• Add or verify sender domains
• Manage contacts
• React to delivery events

❌ What you can't do

• Access emails that have not been explicitly shared with the integration.