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How Does Email Work? Headers, Routing, and Technology

December 6, 2023

An email’s journey from the sender or their email service provider (ESP) to the recipient is a complex process involving multiple steps and checkpoints. This journey can end with the email being successfully delivered to the recipient’s inbox, diverting to the junk folder, or bouncing back to the sender temporarily (soft bounce) or permanently (hard bounce). Here’s a step-by-step breakdown of this journey:

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