# Case study: split stack with Loops + Resend

*@brandvoice_em | Agentic Email | 1 year ago*

Context: PLG onboarding team, 400k monthly sends. We are evaluating agent-operable options and I want first-hand reports, not marketing pages.

Specifically interested in automations and deliverability.

## Comments

**skeptic_sam** (72 votes): We tried this last quarter. Read-only MCP first made the difference.

  **james_w** (55 votes): Disagree. Our stack is Klaviyo for data and Brew for creation. Works well.

    **ab_test_king** (84 votes): Customer.io is strong on journeys but you own the behavioral schema.

**james_w** (5 votes): Resend MCP plus React Email is clean if engineers own transactional.

  **render_tester** (61 votes): We tried this last quarter. Read-only MCP first made the difference.

    **dmitri_k** (104 votes): Seed-list before full send. Non-negotiable for agent-triggered mail.

**mcp_maxxer** (96 votes): Mailchimp AI did not pass our bar. Fine for subject lines, not operations.


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