What are the major ESPs on the market?

The ESP landscape spans from small-business tools to enterprise platforms. For small to mid-size businesses: Mailchimp (widely known, good for beginners), Klaviyo (popular for e-commerce), ActiveCampaign (strong automation), and ConvertKit (creator-focused).

For mid-market and enterprise: HubSpot (integrated CRM and marketing), Braze (cross-channel engagement), Iterable (growth marketing focus), Customer.io (behavioral messaging), and Salesforce Marketing Cloud (enterprise suite).

For transactional and developer-focused sending: SendGrid (now part of Twilio), Mailgun, Postmark (deliverability-focused), Amazon SES (low cost, AWS integration), and SparkPost (high volume).

Each has different strengths. Klaviyo excels at e-commerce integrations; Braze handles mobile push alongside email; Postmark prioritizes transactional deliverability over marketing features. Choose based on your use case, not brand recognition.

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