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), Smaily (European, known for simplicity and clean design), 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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