Send Email (via Resend)

Sends a transactional email using Resend. Use it to send notifications, confirmations, alerts, or any programmatic email from a workflow.

Requirements

This plugin requires a Resend account and API key:

Sign up at resend.com
Verify your sending domain in the Resend dashboard
Create an API key at resend.com/api-keys
Add it as an environment variable named RESEND_API_KEY on the Env Vars page

Inputs

Handle	Type	Description
`text`	string	Plain text email body. Connect an upstream string output or Code node result.
`html`	string	HTML email body. Takes priority over `text` when connected.
`to`	string	Recipient address override. Overrides the `to` setting — useful when the recipient is dynamic.

Output

Handle	Type	Description
`result`	object	Email send result

The result (accessed as {{ email_result.* }}) shape:

Field	Type	Description
`id`	string	Resend message ID
`success`	boolean	Whether the send succeeded
`error`	string	Error message if `success` is `false`

Settings

Setting	Type	Description
`from`	string	Sender address. Must be from a verified Resend domain (e.g., `[email protected]`).
`fromName`	string	Sender display name. Appears as "Name <address>" in the inbox. Optional.
`to`	string	Recipient address. Supports template bindings. Can be overridden by the `to` input handle.
`subject`	string	Email subject line. Supports template bindings.
`replyTo`	string	Optional reply-to address.

Example

Send a payment confirmation email when a Stripe payment succeeds:

From: [email protected]
From Name: Your App Billing
To: {{ transform.customerEmail }}
Subject: Payment received — ${{ transform.amountFormatted }}
Text input handle: connected from a Code node that builds the email body

Code node building the body:

return f"""Hi {input['customerName']},

Your payment of ${input['amountFormatted']} has been received.

Order ID: {input['orderId']}
Date: {input['date']}

Thank you for your business.
"""

HTML Emails

Connect an HTML string to the html input handle. When both text and html are connected, html takes priority. The text version serves as a fallback for email clients that do not render HTML.

Dynamic Recipients

When the recipient address comes from upstream data (e.g., a user record from a database), connect the result to the to input handle instead of hardcoding it in the settings.

Common Gotchas

Unverified domain: Resend will reject sends from unverified domains. Verify your domain at resend.com/domains before going to production.
Missing RESEND_API_KEY: If the env var is not set, the node will fail at runtime with an authentication error. Add it on the Env Vars page.
Check email_result.success: The node does not automatically stop execution if the send fails. Add an If node after Send Email to check {{ email_result.success }} if you need to handle failures.