An Email Service Provider (ESP) is a software platform that helps businesses manage and send email campaigns to their subscriber lists. It provides tools to create, schedule, and track email communications.
Typically, ESPs help you create email templates, manage subscribers lists, and monitor email marketing metrics.
The top ESPs include Brevo, Mailchimp, Constant Contact, HubSpot, Klaviyo, and GetResponse.
The term ESP can also be used to refer to email clients (e.g. Gmail, Outlook).