Introduction
A collection of answers to frequently asked questions.
Domains & Verification
Section titled “Domains & Verification”How do I avoid conflicts with my MX records?
Add DNS records without conflicting with existing MX records.
What if my domain is not verifying?
What to do when your domain isn't verifying.
DNS Guides
Section titled “DNS Guides”Step-by-step instructions for verifying your domain with popular DNS providers.
Cloudflare DNS Guide
Gandi DNS Guide
GoDaddy DNS Guide
DreamHost DNS Guide
Hetzner DNS Guide
Hostinger DNS Guide
IONOS DNS Guide
Namecheap DNS Guide
Porkbun DNS Guide
Route 53 DNS Guide
Squarespace DNS Guide
Strato DNS Guide
Vercel DNS Guide
Deliverability
Section titled “Deliverability”How do I avoid Gmail's spam folder?
Learn how to improve inbox placement in Gmail.
Why Are My Emails Going to Spam?
Troubleshoot emails landing in spam or getting quarantined.
Is it better to send from a subdomain or root domain?
Discover why sending emails from a subdomain can be better than using a root domain.
Why are my emails landing on the suppression list?
Learn why your emails land on the suppression list, and how to remove them.
Domain and IP Warm-up Guide
Learn how to warm up your domain and dedicated IP for optimal deliverability.
Sending
Section titled “Sending”Account Quotas and Limits
Understand the sending quotas and rate limits for your Resend account.
How do Dedicated IPs Work?
Learn how Dedicated IPs work and how to request them.
What sending feature should I use?
Find the right Resend feature for your email sending use case.
Should I add an unsubscribe link?
Learn when to add unsubscribe links to your transactional and marketing emails.
Tutorials
Section titled “Tutorials”Maximize deliverability for Supabase Auth emails
Everything you should do before sending authentication emails with Resend and Supabase.
How do I set up Apple Branded Mail?
Display your brand logo in the Apple Mail inbox.
How do I send with an avatar?
Learn how to show your avatar in the inbox of your recipients.
Forward emails with Resend Inbound
Set up email forwarding using Resend's inbound email processing.
Template emails with React Email
Author email templates as React components and upload them to Resend with the CLI.
Embed the React Email editor
Add the open-source visual email editor to your own application.
Troubleshooting
Section titled “Troubleshooting”How do I fix CORS issues?
Recommended options to avoid CORS errors when sending emails.
403 Error: Domain Mismatch
Resolve 403 errors when the sending domain doesn't match your verified domain.
Domain Already Registered by Another Account
Resolve domain ownership conflicts when a domain is already registered.
Email says delivered but not received?
Steps to take when an email is delivered but the recipient hasn't received it.
AI Tools
Section titled “AI Tools”AI Onboarding
Everything you need to onboard your AI agent to Resend.
MCP Server
Use Resend's Model Context Protocol server to send emails from AI tools.
Email Best Practices Skills
Skills for AI agents to build production-ready email systems with Resend.
React Email Skill
Skills for AI agents to build HTML emails using React components with Resend.
Resend Skill
Skills for AI agents to send emails with Resend.
Account Management
Section titled “Account Management”What is Resend Pricing?
Learn more about Resend's pricing plans.
How can I delete my Resend account?
Learn how to permanently delete your Resend account and data.
How to handle API keys
Best practices for managing and securing your Resend API keys.
How to handle a leaked API key
What to do when an API key is exposed or used without authorization.
How to add multi-factor authentication to your Resend account
Enable or disable multi-factor authentication (MFA) or two-factor authentication (2FA) on your Resend account.