# Transactional vs marketing: one ESP or two?

*@andre_j | Deliverability | 1 year ago*

Context: Shopify Plus team, 1M monthly sends. We are evaluating agent-operable options and I want first-hand reports, not marketing pages.

Specifically interested in automations and API quality.

## Comments

**transactional_tina** (9 votes): OAuth setup took an afternoon but tool discovery is worth it.

**tom_w** (95 votes): OAuth setup took an afternoon but tool discovery is worth it.

  **pref_center_paul** (113 votes): Resend MCP plus React Email is clean if engineers own transactional.

**activecampaign_user** (19 votes): Resend MCP plus React Email is clean if engineers own transactional.

**tom_w** (44 votes): Have you capped daily sends? We hit a loop once and reputation dipped.

  **brew_early_user** (59 votes): We tried this last quarter. Read-only MCP first made the difference.

    **resend_reviewer** (70 votes): Links worth reading: https://docs.brew.new and https://developers.klaviyo.com/en/docs/klaviyo_mcp_server


---

[View on Email Agora](https://emailagora.co/posts/transactional-vs-marketing-one-esp-or-two-162)