---
title: Resend
description: Send emails with Resend.
---

import { BlockInfoCard } from "@/components/ui/block-info-card"

<BlockInfoCard 
  type="resend"
  color="#181C1E"
/>

{/* MANUAL-CONTENT-START:intro */}
[Resend](https://resend.com/) is a modern email service designed for developers to send transactional and marketing emails with ease. It provides a simple, reliable API and dashboard for managing email delivery, templates, and analytics, making it a popular choice for integrating email functionality into applications and workflows.

With Resend, you can:

- **Send transactional emails**: Deliver password resets, notifications, confirmations, and more with high deliverability
- **Manage templates**: Create and update email templates for consistent branding and messaging
- **Track analytics**: Monitor delivery, open, and click rates to optimize your email performance
- **Integrate easily**: Use a straightforward API and SDKs for seamless integration with your applications
- **Ensure security**: Benefit from robust authentication and domain verification to protect your email reputation

In Sim, the Resend integration allows your agents to programmatically send emails as part of your automated workflows. This enables use cases such as sending notifications, alerts, or custom messages directly from your Sim-powered agents. By connecting Sim with Resend, you can automate communication tasks, ensuring timely and reliable email delivery without manual intervention. The integration leverages your Resend API key, keeping your credentials secure while enabling powerful email automation scenarios.
{/* MANUAL-CONTENT-END */}


## Usage Instructions

Integrate Resend into the workflow. Can send emails. Requires API Key.



## Tools

### `resend_send`

Send an email using your own Resend API key and from address

#### Input

| Parameter | Type | Required | Description |
| --------- | ---- | -------- | ----------- |
| `fromAddress` | string | Yes | Email address to send from |
| `to` | string | Yes | Recipient email address |
| `subject` | string | Yes | Email subject |
| `body` | string | Yes | Email body content |
| `contentType` | string | No | Content type for the email body \(text or html\) |
| `resendApiKey` | string | Yes | Resend API key for sending emails |

#### Output

| Parameter | Type | Description |
| --------- | ---- | ----------- |
| `success` | boolean | Whether the email was sent successfully |
| `to` | string | Recipient email address |
| `subject` | string | Email subject |
| `body` | string | Email body content |


