An email service provider (ESP) is a company that provides the infrastructure and tools to send marketing and transactional email at scale — managing servers, authentication, deliverability, and reporting so senders don't have to run their own mail servers. Mailpro is an ESP built on Swiss-hosted, authenticated infrastructure.

What an ESP handles

An ESP maintains sending IPs and their reputation, handles SPF, DKIM, and DMARC authentication, processes bounces and unsubscribes, and reports on delivery and engagement — with campaign tools on top. See Mailpro's SMTP sending server and email campaign tools.

Why it matters

Sending bulk email from an ordinary mailbox gets you blocked quickly; an ESP protects deliverability and keeps you compliant. When comparing providers, weigh deliverability, data hosting, and pricing model — see how to choose email marketing software. Related: SMTP and deliverability.

Choosing between providers? Compare the options in our guide to the best Amazon SES alternatives.

Mailpro and email delivery

An ESP that puts your mail in the inbox

Authenticated sending, Swiss hosting, and reputation management — so your campaigns actually arrive.

Start free with Mailpro Explore Mailpro SMTP

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