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    ESP (Email Service Provider)

    By Carlos Gil, Founder & Editor, The Best Network · Updated

    A platform that lets you send marketing email at scale, such as Mailchimp, Kit, ActiveCampaign or Klaviyo.

    An ESP handles the messy parts of email: managing IP reputation, authentication, bounce handling, unsubscribes, and the API/UI for sending campaigns. Picking the right ESP for your stage and use case is one of the highest-leverage decisions in email marketing.

    Related terms

    Transactional Email

    A one-off email triggered by a specific user action, such as a receipt, password reset or shipping notification.

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