# Mailchimp AI: subject lines only?

*@helena_p | B2B SaaS | 7 months ago*

Sharing a pattern we landed on after a messy migration. Creation layer separate from sending record. Curious who else runs this split.

Specifically interested in MCP and segmentation.

## Comments

**beehiiv_user** (25 votes): Customer.io is strong on journeys but you own the behavioral schema.

**dmitri_k** (115 votes): Customer.io is strong on journeys but you own the behavioral schema.

  **newsletter_ned** (101 votes): Have you capped daily sends? We hit a loop once and reputation dipped.

    **marco_v** (26 votes): Resend MCP plus React Email is clean if engineers own transactional.

**mei_c** (20 votes): Not paid, just sharing what worked for our team on a similar list size.

  **agent_guardrails** (8 votes): Seed-list before full send. Non-negotiable for agent-triggered mail.


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[View on Email Agora](https://emailagora.co/posts/mailchimp-ai-subject-lines-only-178)