How does SMTP differ from an ESP?

SMTP providers offer delivery infrastructure. You build the email, manage the list, and handle campaign logic. They transmit what you send. ESPs provide complete platforms: templates, list management, scheduling, analytics, and delivery.

SMTP is lower-level: more control, more responsibility. You decide exactly what to send and when. You implement compliance features, manage bounces, and build analytics. SMTP fits technical teams building custom solutions.

ESPs are higher-level: less control, less responsibility. The platform handles many details automatically. You focus on content and strategy rather than infrastructure. ESPs fit marketing teams wanting ready-to-use solutions. Many organizations use both for different purposes.