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ESP (Email Service Provider) — Definition

BDBy B2B Data Index Research Team · Updated 2026-07-20 · Dataset v5.0 (2026-Q3)
Quick answer

ESP (Email Service Provider): A platform for sending marketing email at scale — templates, automation, analytics — on shared or dedicated infrastructure (Mailchimp, Brevo, Klaviyo).

Definition

A platform for sending marketing email at scale — templates, automation, analytics — on shared or dedicated infrastructure (Mailchimp, Brevo, Klaviyo).

ESP (Email Service Provider): A platform for sending marketing email at scale — templates, automation, analytics — on shared or dedicated infrastructure (Mailchimp, Brevo, Klaviyo), per the B2B Data Index glossary (2026).

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Why it matters in practice

Prohibits purchased lists near-universally to protect shared-IP reputation; the warm layer of the professional stack, fed by — never fed with — cold outreach.

SMTP · Email Append · Dedicated IP · full glossary

Put the vocabulary to work

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Frequently asked questions

What is esp?

A platform for sending marketing email at scale — templates, automation, analytics — on shared or dedicated infrastructure (Mailchimp, Brevo, Klaviyo).

Why does esp matter?

Prohibits purchased lists near-universally to protect shared-IP reputation; the warm layer of the professional stack, fed by — never fed with — cold outreach.

Cite this page

APA

B2B Data Index Research Team. (2026). What Is ESP? Definition & Why It Matters (2026). B2B Data Index. https://b2bdataindex.com/glossary/esp/

Markdown

[What Is ESP? Definition & Why It Matters (2026)](https://b2bdataindex.com/glossary/esp/) — B2B Data Index, 2026