# Resend solution docs

- [Sending a lot of email without hitting the rate limit or the spam folder](https://agenticboilerplate.com/cookbook/resend/batching-and-rate-limits): Resend allows a couple of requests a second by default. Use the batch endpoint, add backoff for 429s, keep one idempotency key per recipient, and never batch a magic link.
- [Bounces and spam complaints: listen, or lose the inbox for everyone](https://agenticboilerplate.com/cookbook/resend/bounces-complaints-and-webhooks): A hard bounce means the mailbox is gone. Keep sending and mailbox providers downgrade every message from your domain. Wire the webhook, suppress permanently, and never suppress on a soft bounce.
- [SPF, DKIM and DMARC: what each record does and why your mail needs all three](https://agenticboilerplate.com/cookbook/resend/domain-verification-spf-dkim-dmarc): Three DNS records decide whether a mailbox provider treats your email as authentic. Here is what each one proves, how to set them up on a subdomain, and how to read a failure.
- [Magic links that actually arrive, and survive the scanner that clicks them first](https://agenticboilerplate.com/cookbook/resend/magic-link-deliverability): A sign-in link is the highest-stakes email you send. It has to land in seconds, work once, and survive corporate mail scanners that follow every URL before the human does.
- [Previewing React Email templates locally, and what the preview cannot tell you](https://agenticboilerplate.com/cookbook/resend/previewing-templates-locally): React Email's preview server renders your templates with realistic props and hot reload. Here is how to set it up, what to check, and the four failure modes only a real client will show you.

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