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A user performs an action on your website or app, like making a purchase, signing up, or resetting a password.

Your server-side code receives the trigger, processes the request, and prepares the email content and recipient data.

A single, structured HTTP request is sent to an ESP like SendGrid, Mailgun, or AWS SES.

The application connects to an SMTP server and sends a sequence of commands to transmit the email.

Regardless of the path, the email is delivered to the user's inbox, completing the process.


