html:not(.dark) .codeblock-light .line-highlight:after,
html:not(.dark) .codeblock-light .line-highlight {
  background: #00cc9937;
}

html:not(.dark) .codeblock-light .line-highlight:after,
html:not(.dark) .codeblock-light .line-highlight:before {
  background: #00cc9937;
}

html.dark .line-highlight,
html:not(.dark) .codeblock-dark .line-highlight {
  background: #00fff61d;
}

html.dark .line-highlight:after,
html.dark .line-highlight:before,
html:not(.dark) .codeblock-dark .line-highlight:after,
html:not(.dark) .codeblock-dark .line-highlight:before {
  background: #00fff61d;
}

html.dark .line-highlight:before,
html:not(.dark) .codeblock-dark .line-highlight:before {
  border-color: #4cd7b8;
}

html:not(.dark) .codeblock-light .line-highlight:before {
  border-color: #55d799;
}


module.exports = {
  quoteProps: 'consistent',
  singleQuote: true,
  trailingComma: 'all',
  printWidth: 80,
  useTabs: false,
  bracketSpacing: true,
};


const fs = require('node:fs');

const eventPath = process.env.GITHUB_EVENT_PATH;
const eventJson = JSON.parse(fs.readFileSync(eventPath, 'utf8'));
const prTitle = eventJson.pull_request.title;

const isValidType = (title) =>
  /^(feat|fix|chore|refactor)($[a-zA-Z0-9-]+$)?:\s[a-z].*$/.test(title);

const validateTitle = (title) => {
  if (!isValidType(title)) {
    console.error(
      `PR title does not follow the required format.
      example: "type: My PR Title"

      - type: "feat", "fix", "chore", or "refactor"
      - First letter of the PR title needs to be lowercased
      `,
    );
    process.exit(1);
  }

  console.info('PR title is valid');
};

validateTitle(prTitle);


Prerequisites

1. Install

2. Send email using HTML

3. Try it yourself

API Reference

Knowledge Base

Resend

Documentation

Get Started

Sign In

Learn how to send your first email using the Resend Ruby SDK.

Introduction

Learn how to send your first email using the Resend Node.js SDK.

Learn how to send your first email using Next.js and the Resend Node.js SDK.

Next.js

Learn how to send your first email using Remix and the Resend Node.js SDK.

Remix

Learn how to send your first email using Nuxt and the Resend Node.js SDK.

Nuxt

Learn how to send your first email using Express and the Resend Node.js SDK.

Express

Learn how to send your first email using Redwood.js and the Resend Node.js SDK.

RedwoodJS

Learn how to send your first email using Hono and the Resend Node.js SDK.

Hono

Learn how to send your first email using Bun and the Resend Node.js SDK.

Learn how to send your first email using Astro, Resend, and Node.js.

Astro

Learn how to send your first email using Vercel Functions.

Vercel Functions

Learn how to send your first email using Supabase Edge Functions.

Supabase Edge Functions

Learn how to send your first email using Cloudflare Workers.

Cloudflare Workers

Learn how to send your first email using Deno Deploy.

Deno Deploy

Learn how to send your first email using AWS Lambda.

AWS Lambda

Learn how to send your first email using the Resend PHP SDK.

Learn how to send your first email using Laravel.

Laravel

Learn how to send your first email using the Symfony Resend Mailer Bridge.

Symfony

Learn how to send your first email using Rails and the Resend Ruby SDK.

Ruby and Rails

Learn how to send your first email using Sinatra and the Resend Ruby SDK.

Sinatra

Learn how to send your first email using the Resend Python SDK.

Learn how to send your first email using Flask and the Resend Python SDK.

Flask

Learn how to send your first email using FastAPI and the Resend Python SDK.

FastAPI

Learn how to send your first email using the Resend Go SDK.

Learn how to send your first email using the Resend Rust SDK.

Send your first email using Axum and the Resend Rust SDK.

Axum

Learn how to send your first email using the Resend Elixir SDK.

Learn how to send your first email using Phoenix and the Resend Elixir SDK.

Phoenix

Learn how to send your first email using the Resend Java SDK.

Learn how to integrate Auth0 with Resend SMTP.

Auth0

Auth0 with SMTP

Learn how to integrate Customer.io with Resend SMTP.

Customer.io

Customer.io with SMTP

Learn how to integrate Django with Resend SMTP.

Django

Django with SMTP

Learn how to send your first email using Laravel with SMTP.

Laravel with SMTP

Learn how to integrate Liferay with Resend SMTP.

Liferay

Liferay with SMTP

Learn how to send your first email using Nodemailer with SMTP.

Nodemailer

Nodemailer with SMTP

Learn how to integrate Rails with Resend SMTP.

Rails

Rails with SMTP

Learn how to integrate Retool with Resend SMTP.

Retool

Retool with SMTP

Learn how to integrate Supabase Auth with Resend SMTP.

Supabase

Supabase with SMTP

Learn how to send your first email using Wordpress.

WordPress

Learn how to send your first email using NextAuth.

NextAuth

Learn how to integrate Metabase with Resend SMTP.

Metabase

Metabse with SMTP

Understand general concepts, response codes, and authentication strategies.

Troubleshoot problems with this comprehensive breakdown of all error codes.

Errors

Start sending emails through the Resend Email API.

Send Email

Send Batch Emails

Retrieve Email

Update Email

Cancel Email

Create a domain through the Resend Email API.

Create Domain

Retrieve a single domain for the authenticated user.

Retrieve Domain

Verify Domain

Update Domain

Retrieve a list of domains for the authenticated user.

List Domains

Delete Domain

Add a new API key to authenticate communications with Resend.

Create API key

Retrieve a list of API keys for the authenticated user.

List API keys

Delete API key

Create a new broadcast to send to your audience.

Create Broadcast

Retrieve Broadcast

Start sending broadcasts to your audience through the Resend API.

Send Broadcast

Delete Broadcast

List Broadcasts

Create Audience

Retrieve Audience

Delete Audience

List Audiences

Create Contact

Retrieve a single contact from an audience.

Retrieve Contact

Update Contact

Remove an existing contact from an audience.

Delete Contact

List Contacts

Visualize all the email on the Resend Dashboard.

Attachments

Send emails at a specific time without additional complexity.

Schedule Email

Simulate different events by sending test emails.

Send Test Emails

Customize how emails are sent with your own headers.

Custom Headers

Understanding and resolving delivery issues.

Email Bounces

Use high quality, unstyled components for your transactional emails using React and Typescript

Email Templates

Improve your deliverability with tailored insights based on your sending.

Deliverability Insights

Learn how to give email recipients the ability to unsubscribe without searching for the unsubscribe link.

Unsubscribe Link

Add an unsubscribe link to transactional emails

DMARC

Set up BIMI to gain brand recognition by displaying your logo in the inbox.

BIMI

Resend offers sending from multiple regions

Regions

Choosing a Region

Verify your domain on Route 53 with Resend.

AWS Route 53

Verify your domain on Cloudflare with Resend.

Cloudflare

Verify your domain on Namecheap with Resend.

Namecheap

Verify your domain on Vercel with Resend.

Vercel

Visualize all the API Keys on the Resend Dashboard.

Use webhooks to notify your application about email events.

List of supported event types and their payload.

Event types

Learn how to use the signing secret to verify your webhooks.

Verify Webhooks Requests

Learn how to add, update, retrieve, and remove contacts that you send Broadcasts to.

How to manage and import contacts to your audiences.

Contacts

Learn how to check and remove recipients who have unsubscribed to your marketing emails.

Subscriptions

Managing Unsubscribed Contacts

Send marketing emails efficiently without code.

Track your Broadcasts email performance in real-time

Performance Tracking

Explore sample apps for different use cases.

Examples

Open source client libraries for your favorite platforms.

SDKs

An overview of Resend security features and practices.

Security

Integrate Resend with the tools you already use.

Integrations

A collection of answers to frequently asked questions.

Learn how to avoid conflicts with your existing MX records when setting up a Resend domain.

Documentation

Quickstart

Learn

Resources

Introduction

Prerequisites

1. Install

2. Send email using HTML

3. Try it yourself

Ruby Example

Documentation

Quickstart

Learn

Resources

​Prerequisites

​1. Install

​2. Send email using HTML

​3. Try it yourself

Ruby Example

Prerequisites

1. Install

2. Send email using HTML

3. Try it yourself