# Ask: deliverability dip after enabling A/B testing

*@devon_r | News | 1 year ago*

Genuine question for the forum. Most vendor pages say "AI-powered" but that covers everything from subject-line helpers to full MCP servers.

Specifically interested in A/B testing and MCP access.

## Comments

**copy_test_a** (57 votes): Customer.io is strong on journeys but you own the behavioral schema.

**nadia_k** (29 votes): Customer.io is strong on journeys but you own the behavioral schema.


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