Resend

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At a glance

• Availability: Experimental (how to enable).
• Auth: API key.
• Connection: The key comes from RESEND_API_KEY.
• Docs: https://resend.com/docs/api-reference/introduction

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Credentials

Set these per environment. See Connect an integration.

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Setup

1. Sign in to Resend: Go to https://resend.com and sign in. The free tier is sufficient for testing.
2. Verify a domain (or use onboarding sender): Add and verify a sending domain under https://resend.com/domains. For quick tests you can send from [email protected] to your own account email.
3. Create an API key: Open https://resend.com/api-keys and create a key with Full Access (Sending Access alone cannot read domains/audiences).
4. Set the environment variable: Add the key to your .env as RESEND_API_KEY=re_…
5. Verify access: Run List Domains to confirm the key works, then send a test email to yourself.

• Resend authenticates with ‘Authorization: Bearer re_…’
• Audiences and contacts power Broadcasts; transactional sending only requires a verified domain

Provider API reference: https://resend.com/docs/api-reference/introduction

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Tools

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Example prompts

• Send an email via Resend with a subject, recipient, and HTML body.
• List my Resend domains and tell me which ones are verified for sending.