Resend Connection

Connects your agent to Resend for transactional and broadcast email. Send via API, manage audiences and contacts, and read delivery events.

Authentication

API key. Generate at resend.com → API Keys.

• RESEND_API_KEY — re_... token, sent as Bearer

Endpoints

Sending

• POST /emails — Send a single email (transactional)
• POST /emails/batch — Send up to 100 emails in one request
• GET /emails/{email_id} — Look up delivery state

Audiences & contacts

• GET /audiences — List broadcast audiences
• GET /audiences/{audience_id}/contacts — Members of an audience
• POST /audiences/{audience_id}/contacts — Add a contact (requires confirmation for >1)

Broadcasts

• GET /broadcasts — List broadcast sends
• GET /broadcasts/{broadcast_id} — Broadcast detail
• POST /broadcasts — Draft a broadcast (does not send)

Domains

• GET /domains — Verified sending domains and their status

Rules

• Rate limit: 10 requests/second by default; check X-RateLimit-* headers
• All sends require a from-address on a verified domain
• Bulk sends (>100 recipients) require human confirmation
• Contact emails are PII — redact in logs