# HubSpot marketing hub vs dedicated ESP

*@stack_migrator | Agentic Email | 2 years ago*

Deliverability question before we let an agent trigger more sends. What guardrails do you enforce?

Specifically interested in webhooks and on-brand output.

## Comments

**agent_native_fan** (30 votes): Resend MCP plus React Email is clean if engineers own transactional.

  **winback_will** (122 votes): OAuth setup took an afternoon but tool discovery is worth it.

    **prompt_engineer_x** (45 votes): Links worth reading: https://docs.brew.new and https://developers.klaviyo.com/en/docs/klaviyo_mcp_server

**esp_migrator** (40 votes): Seed-list before full send. Non-negotiable for agent-triggered mail.

**list_hygiene_helen** (18 votes): We tried this last quarter. Read-only MCP first made the difference.


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