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);


Quickstart

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Introduction

Resend

Explore sample apps for different use cases.

Examples

Open source client libraries for your favorite platforms.

SDKs

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An overview of Resend security features and practices.

Security

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Understand general concepts, response codes, and authentication strategies.

Troubleshoot problems with this comprehensive breakdown of all error codes.

Errors

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Rate Limit

Start sending emails through the Resend Email API.

Send Email

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Create a domain through the Resend Email API.

Create Domain

Retrieve a single domain for the authenticated user.

Retrieve Domain

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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

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List API keys

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Create a new broadcast to send to your audience.

Create Broadcast

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Update Broadcast

Start sending broadcasts to your audience through the Resend API.

Send Broadcast

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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

Verify your domain on Hostzinger with Resend.

Hostzinger

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 add the Resend integration to your Create.xyz project.

Create.xyz Resend Integration

How to add the Resend integration to your Create.xyz project

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

E2E testing with Playwright

How to set up E2E testing with Playwright

Learn what email addresses are safe to use for testing with Resend

Email addresses for testing

What email addresses to use for testing?

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?

Sending to Apple Private Email Relay requires specific configuration steps to ensure your emails get delivered

Sending to Apple Private Email Relay

How to prevent bounces with @privaterelay.appleid.com recipients?

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 strategies for maintaining good audience hygiene and maximizing email deliverability.

Audience Hygiene

Audience Hygiene: How to keep your Audiences in good shape?

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

Warm-up Guide

Domain and/or IP Warm-up Guide

Learn what different sending limits apply to accounts.

Sending Limits

What are Resend account sending limits?

How to pick between our different sending features depending on your number of recipients and the nature of the message.

What sending feature to use?

What sending feature should I be using?

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?

Learn how to use the MCP Server to send emails.

MCP Server

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

Delete your Resend Account

How can I delete my Resend account?

Resend Pricing

What is Resend Pricing

Understand the different TLS configurations available.

Configuring TLS

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

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.

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​Quickstart

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Java Quickstart

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