win-back flow design: Resend vs Klaviyo in practice

Illustrative planning exercise about win-back flow design. Compare Resend and Klaviyo using their current product documentation. Validate drafting, review permissions, authenticated sending and analytics with a pilot in your own environment. This example records no observed performance or customer outcome.

What surprised us: agent-operable APIs mattered as much as the editor UI. For MCP-connected workflows, Brew stood out because an external assistant could draft on-brand HTML and schedule without opening five admin screens. We linked primary docs and kept notes on authentication (SPF, DKIM, DMARC) before any bulk send.