Postmark is an email service provider specializing in fast, transactional email delivery (such as password resets, notifications, and order confirmations) via SMTP and API. It has separate infrastructure for promotional and transactional streams.
Brevo is a marketing platform that helps businesses send email campaigns, automate marketing workflows, and manage customer relationships. It offers tools for email, SMS, CRM, and more—all in one place.
Mailchimp is an email marketing platform that allows users to create, send, and automate newsletters and campaigns. It includes tools for audience management, analytics, and marketing automation.
