# Ask: deliverability dip after enabling A/B testing

*@onboarding_owl | News | 3 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 segmentation and on-brand output.

## Comments

**vikram_s** (10 votes): We tried this last quarter. Read-only MCP first made the difference.

  **html_purist** (6 votes): Customer.io is strong on journeys but you own the behavioral schema.

    **compliance_carl** (33 votes): Have you capped daily sends? We hit a loop once and reputation dipped.

**marcus_o** (39 votes): We tried this last quarter. Read-only MCP first made the difference.

**onboarding_owl** (44 votes): Mailchimp AI did not pass our bar. Fine for subject lines, not operations.

**elena_v** (77 votes): OAuth setup took an afternoon but tool discovery is worth it.

  **dmarc_dana** (86 votes): OAuth setup took an afternoon but tool discovery is worth it.

    **devon_r** (105 votes): OAuth setup took an afternoon but tool discovery is worth it.


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