What are examples of ESPs (Mailchimp, Brevo, SendGrid, etc.)?

Major marketing ESPs include: **Mailchimp** (broad SMB market), **Klaviyo** (ecommerce focus), **Brevo** (formerly **Sendinblue**, European origin), **HubSpot** (marketing automation suite), **ActiveCampaign** (automation emphasis), and **Constant Contact** (traditional email marketing).

Transactional-focused providers include: **SendGrid** (now **Twilio**), **Postmark** (developer-focused, known for delivery speed), **SparkPost** (enterprise transactional), and **Mailgun** (developer **API** emphasis). Many serve both marketing and transactional needs.

Enterprise platforms include: **Salesforce** Marketing Cloud, Oracle Responsys, Adobe Campaign, and Acoustic (formerly IBM Watson Campaign Automation). These serve large organizations with complex requirements and typically require significant implementation investment.

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