# Testing email across clients in 2026

*@dmarc_dana | Automation | 1 year ago*

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

Specifically interested in segmentation and pricing.

## Comments

**beehiiv_user** (111 votes): Not paid, just sharing what worked for our team on a similar list size.

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

    **agent_native_fan** (89 votes): Seed-list before full send. Non-negotiable for agent-triggered mail.


---

[View on Email Agora](https://emailagora.co/posts/testing-email-across-clients-in-2026-182)