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 = {
  bracketSpacing: true,
  printWidth: 80,
  quoteProps: 'consistent',
  singleQuote: true,
  tabWidth: 2,
  trailingComma: 'all',
  useTabs: false,
};


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);


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Integrate Resend with the tools you already use.

Integrations

Resend

Introduction

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

Understand general concepts, response codes, and authentication strategies.

Troubleshoot problems with this comprehensive breakdown of all error codes.

Errors

Understand rate limits and how to increase them.

Rate Limit

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

A collection of answers to frequently asked questions.

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

Avoid MX Conflicts

How do I avoid conflicts with my MX records?

Learn what steps to take when your domain doesn't seem to verifying.

Domain Not Verifying

What if my domain is not verifying?

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

Verify your domain on Squarespace with Resend.

Squarespace

End to end testing ensures your entire app flow is fully functioning.

E2E testing with Playwright

How to set up E2E testing with Playwright

Everything you should do before you start sending authentication emails with Resend and Supabase.

Supabase Go-Live Checklist

How do I maximize deliverability for Supabase Auth emails?

Learn how to implement Apple Branded Mail to display your logo in Apple Mail clients.

Set up your logo on Apple Mail

How do I set up Apple Branded Mail?

Learn how to show your avatar in the inbox of your recipients.

Send with an Avatar

How do I send with an avatar?

Learn how to improve inbox placement in Gmail.

Avoid Gmail's Spam Folder

How do I avoid Gmail's spam folder?

Learn how to improve inbox placement in Outlook.

Avoid Outlook's Spam Folder

How do I avoid Outlook's spam folder?

Information on recommended options to avoid CORS errors when sending emails.

CORS Issues

How do I fix CORS issues?

Learn why your emails land on the Suppression List and how to remove them.

Managing the Suppression List

Why are my emails landing on the Suppression List?

Resend does not offer the functionality to receive email but there are a few workarounds that could help.

Receiving Emails

Can I receive emails with Resend?

Discover why sending emails from a subdomain can be better than using a root domain.

Subdomain vs Root Domain

Is it better to send emails from a subdomain or the root domain?

Learn the steps to take when an email is delivered, but the recipient does not receive it.

Delivered Email Not Arriving

What if an email says delivered but the recipient has not received it?

Learn why your open rate statistics are not accurate and what you can do about it.

Open Rates Not Accurate

Why are my open rates not accurate?

Learn how to warm up a domain or IP to avoid deliverability issues.

Warm-up Guide

Domain and/or IP Warm-up Guide

Learn best practices about using unsubscribe links.

When to Add an Unsubscribe Link

Should I add an unsubscribe link to all of my emails sent with Resend?

When are Dedicated IPs helpful, and how can they be requested.

How do Dedicated IPs work?

Information on how we can help you protect your customer's information.

Turn Off Message Storage

How do I ensure sensitive data isn't stored on Resend?

Learn which file attachment extensions are unsupported.

Unsupported Attachment Types

What attachment types are not supported?

A workaround for joining different teams.

Joining Multiple Teams

How can I join multiple teams?

How to request your Resend account and data to be deleted.

Delete your Resend Account

How can I delete my Resend account?

Leave your Resend Team

How can I leave my Resend team?

How to change roles of other users in your team.

Change team roles

How can I change the roles of other users in my team?

Resend Pricing

What is Resend Pricing

Understand the different TLS configurations available.

Configuring TLS

What's the difference between Opportunistic TLS vs Enforced TLS?

API Reference

Knowledge Base

Documentation

Get Started

Sign In

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 the Resend Ruby SDK.

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 send your first email using the Resend .NET SDK.

Learn how to integrate Auth0 with Resend SMTP.

Documentation

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Resources

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Create

Wildcard

mcp.run

No-code

Zapier

Pipedream

Activepieces

Swishjam

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Courier

Novu

Knock

Engagespot

Dittofeed

Suprsend

Developer tools

Inngest

Upstash

Trigger.dev

Infisical

Fastgen

Medusa

OpenMeter

Invopop

Prisma Pulse

Payload CMS

Tinybird

Coolify

Build your own integration

Documentation

Quickstart

Learn

Resources

​AI

Lovable

Create

Wildcard

mcp.run

​No-code

Zapier

Pipedream

Activepieces

Swishjam

​Notifications

Courier

Novu

Knock

Engagespot

Dittofeed

Suprsend

​Developer tools

Inngest

Upstash

Trigger.dev

Infisical

Fastgen

Medusa

OpenMeter

Invopop

Prisma Pulse

Payload CMS

Tinybird

Coolify

​Build your own integration

AI

No-code

Notifications

Developer tools

Build your own integration