# ESP

An ESP (email service provider) is a platform that handles email creation, list or audience management, sending infrastructure, and usually analytics. Some ESPs focus on marketing campaigns, others on transactional APIs, and a newer class is AI-native.

**Why it matters:** Choosing an ESP shapes your deliverability posture, automation model, and whether agents can operate email programmatically.

**Canonical:** https://sendemails.dev/glossary/esp

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