> ## Documentation Index
> Fetch the complete documentation index at: https://resend.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Introduction

> A collection of answers to frequently asked questions.

## Domains & Verification

> [card] [How do I avoid conflicts with my MX records?](https://resend.com/docs/knowledge-base/how-do-i-avoid-conflicting-with-my-mx-records.md)
>
> Add DNS records without conflicting with existing MX records.

> [card] [What if my domain is not verifying?](https://resend.com/docs/knowledge-base/what-if-my-domain-is-not-verifying.md)
>
> What to do when your domain isn't verifying.

## DNS Guides

Step-by-step instructions for verifying your domain with popular DNS providers.

> [card] [Cloudflare DNS Guide](https://resend.com/docs/guides/dns/cloudflare.md)

> [card] [Gandi DNS Guide](https://resend.com/docs/guides/dns/gandi.md)

> [card] [GoDaddy DNS Guide](https://resend.com/docs/guides/dns/godaddy.md)

> [card] [DreamHost DNS Guide](https://resend.com/docs/guides/dns/dreamhost.md)

> [card] [Hetzner DNS Guide](https://resend.com/docs/guides/dns/hetzner.md)

> [card] [Hostinger DNS Guide](https://resend.com/docs/guides/dns/hostinger.md)

> [card] [IONOS DNS Guide](https://resend.com/docs/guides/dns/ionos.md)

> [card] [Namecheap DNS Guide](https://resend.com/docs/guides/dns/namecheap.md)

> [card] [Porkbun DNS Guide](https://resend.com/docs/guides/dns/porkbun.md)

> [card] [Route 53 DNS Guide](https://resend.com/docs/guides/dns/route53.md)

> [card] [Squarespace DNS Guide](https://resend.com/docs/guides/dns/squarespace.md)

> [card] [Strato DNS Guide](https://resend.com/docs/guides/dns/strato.md)

> [card] [Vercel DNS Guide](https://resend.com/docs/guides/dns/vercel.md)

## Deliverability

> [card] [How do I avoid Gmail's spam folder?](https://resend.com/guides/email/deliverability/avoid-gmail-spam-folder)
>
> Learn how to improve inbox placement in Gmail.

> [card] [Why Are My Emails Going to Spam?](https://resend.com/guides/email/deliverability/why-emails-go-to-spam)
>
> Troubleshoot emails landing in spam or getting quarantined.

> [card] [Why are my emails landing on the suppression list?](https://resend.com/docs/knowledge-base/why-are-my-emails-landing-on-the-suppression-list.md)
>
> Learn why your emails land on the suppression list, and how to remove them.

> [card] [Domain and IP Warm-up Guide](https://resend.com/docs/knowledge-base/warming-up.md)
>
> Learn how to warm up your domain and dedicated IP for optimal deliverability.

## Sending

> [card] [Account Quotas and Limits](https://resend.com/docs/knowledge-base/account-quotas-and-limits.md)
>
> Understand the sending quotas and rate limits for your Resend account.

> [card] [How do Dedicated IPs Work?](https://resend.com/docs/knowledge-base/how-do-dedicated-ips-work.md)
>
> Learn how Dedicated IPs work and how to request them.

> [card] [What sending feature should I use?](https://resend.com/docs/knowledge-base/what-sending-feature-to-use.md)
>
> Find the right Resend feature for your email sending use case.

> [card] [Should I add an unsubscribe link?](https://resend.com/docs/knowledge-base/should-i-add-an-unsubscribe-link.md)
>
> Learn when to add unsubscribe links to your transactional and marketing
> emails.

## Tutorials

> [card] [Maximize deliverability for Supabase Auth emails](https://resend.com/docs/knowledge-base/how-do-i-maximize-deliverability-for-supabase-auth-emails.md)
>
> Everything you should do before sending authentication emails with Resend and
> Supabase.

> [card] [How do I set up Apple Branded Mail?](https://resend.com/docs/knowledge-base/how-do-i-set-up-apple-branded-mail.md)
>
> Display your brand logo in the Apple Mail inbox.

> [card] [How do I send with an avatar?](https://resend.com/docs/knowledge-base/how-do-i-send-with-an-avatar.md)
>
> Learn how to show your avatar in the inbox of your recipients.

> [card] [Forward emails with Resend Inbound](https://resend.com/docs/knowledge-base/forward-emails-with-resend-inbound.md)
>
> Set up email forwarding using Resend's inbound email processing.

> [card] [Template emails with React Email](https://resend.com/docs/knowledge-base/template-emails-with-react-email.md)
>
> Author email templates as React components and upload them to Resend with the
> CLI.

> [card] [Embed the React Email editor](https://resend.com/docs/knowledge-base/embed-react-email-editor.md)
>
> Add the open-source visual email editor to your own application.

## Troubleshooting

> [card] [How do I fix CORS issues?](https://resend.com/docs/knowledge-base/how-do-i-fix-cors-issues.md)
>
> Recommended options to avoid CORS errors when sending emails.

> [card] [403 Error: Domain Mismatch](https://resend.com/docs/knowledge-base/403-error-domain-mismatch.md)
>
> Resolve 403 errors when the sending domain doesn't match your verified domain.

> [card] [Domain Already Registered by Another Account](https://resend.com/docs/knowledge-base/domain-already-registered.md)
>
> Resolve domain ownership conflicts when a domain is already registered.

> [card] [Email says delivered but not received?](https://resend.com/docs/knowledge-base/what-if-an-email-says-delivered-but-the-recipient-has-not-received-it.md)
>
> Steps to take when an email is delivered but the recipient hasn't received it.

## AI Tools

> [card] [AI Onboarding](https://resend.com/docs/ai-onboarding.md)
>
> Everything you need to onboard your AI agent to Resend.

> [card] [MCP Server](https://resend.com/docs/mcp-server.md)
>
> Use Resend's Model Context Protocol server to send emails from AI tools.

> [card] [Email Best Practices Skills](https://resend.com/docs/email-best-practices-skill.md)
>
> Skills for AI agents to build production-ready email systems with Resend.

> [card] [React Email Skill](https://resend.com/docs/react-email-skill.md)
>
> Skills for AI agents to build HTML emails using React components with Resend.

> [card] [Resend Skill](https://resend.com/docs/resend-skill.md)
>
> Skills for AI agents to send emails with Resend.

## Account Management

> [card] [What is Resend Pricing?](https://resend.com/docs/knowledge-base/what-is-resend-pricing.md)
>
> Learn more about Resend's pricing plans.

> [card] [How can I delete my Resend account?](https://resend.com/docs/knowledge-base/how-can-i-delete-my-resend-account.md)
>
> Learn how to permanently delete your Resend account and data.

> [card] [How to handle API keys](https://resend.com/docs/knowledge-base/how-to-handle-api-keys.md)
>
> Best practices for managing and securing your Resend API keys.

> [card] [How to handle a leaked API key](https://resend.com/docs/knowledge-base/how-to-handle-a-leaked-api-key.md)
>
> What to do when an API key is exposed or used without authorization.

> [card] [How to add multi-factor authentication to your Resend account](https://resend.com/docs/knowledge-base/how-can-i-add-mfa.md)
>
> Enable or disable multi-factor authentication (MFA) or two-factor
> authentication (2FA) on your Resend account.

## Testing

> [card] [E2E Testing with Playwright](https://resend.com/docs/knowledge-base/end-to-end-testing-with-playwright.md)
>
> Set up end-to-end email testing with Playwright and Resend.

> [card] [What email addresses to use for testing?](https://resend.com/docs/knowledge-base/what-email-addresses-to-use-for-testing.md)
>
> Use Resend's test email addresses to simulate different delivery scenarios.