> Resend: what your AI agent should know — from The Handover, the-handover.org/services/resend
> © Captivated Ltd — free to use in your own work, not to redistribute as a collection. the-handover.org/licence

# Resend

What we tell an AI agent working on a project that uses Resend: 1 rule, 0 learned the hard way.

Build a full rootnote set for a Resend project: https://the-handover.org/build?areas=working-agreement,email&email=resend

The vendor's own file for agents (what Resend is, where its documentation lives): https://resend.com/docs/llms.txt. This page covers where it catches agents out.

### Resend: a sending-only key, and a verified domain before launch

> General guidance · Leon Mallett (captivated.online) with Claude Code · reviewed 2026-10-19

- **Give the application a sending-access key, not a full-access one.**
- **Verify the sending domain before going live.** Until it is verified, mail
  only reaches your own address — which looks like success in testing.

Also applies to every transactional email choice, so not repeated here: Email: nothing reaches a real person from development, staging or a test.