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API Reference

Knowledge Base

Resend

Documentation

Get Started

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

Storing Sensitive Data

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

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 Bun and the Resend Node.js SDK.

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

Vercel Edge 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 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 the Resend Go SDK.

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

Retrieve Email

Send Batch Emails

Create a domain through the Resend Email API.

Add 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

Add Audience

Retrieve Audience

Delete Audience

List Audiences

Add 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.

Simulate different events by sending test emails.

Send Test Emails

Understanding and resolving delivery issues.

Email Bounces

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

Email Templates

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

Visualize all the domains on the Resend Dashboard.

Setting up DMARC to prevent email spoofing and protect against unauthorized use of a domain in email messages.

DMARC

Setting up BIMI to become a verified sender and show your logo from the inbox.

BIMI

Resend offers sending from multiple regions

Regions

Choosing a Region

Verify your domain on Cloudflare with Resend.

Cloudflare

Verify your domain on Namecheap with Resend.

Namecheap

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.

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.

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?

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 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?

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 show your avatar in the inbox of your recipients.

Send with an Avatar

How do I send with an avatar?

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 which file attachment extensions are unsupported.

Unsupported Attachment Types

What attachment types are not supported?

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

Domain Not Verifying

What if my domain is not verifying?

Resend Pricing

What is Resend Pricing

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