Infrastructure
Email Service Provider (ESP)
A company that provides email marketing and sending services (e.g., Mailchimp, SendGrid, Klaviyo).
Definition
An Email Service Provider (ESP) is a company offering email marketing services including list management, campaign creation, sending infrastructure, analytics, and automation. ESPs handle the technical aspects of email delivery and provide tools for marketers. Examples include Mailchimp, Klaviyo, SendGrid, Constant Contact, and HubSpot.
Examples
Marketing ESPs: Mailchimp, Klaviyo, Constant ContactTransactional ESPs: SendGrid, Mailgun, Amazon SES