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How does the persistent connection gets established between message queue and the user?

I didn’t quite understand how does the step 4 happens from message queue. If it is sending a mail to the friend using their email address and over SMTP?

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Course: https://www.educative.io/collection/6064040858091520/6411938009448448
Lesson: https://www.educative.io/collection/page/6064040858091520/6411938009448448/4659342001307648

@Lekha Real-time notifications are sent to the app’s client as opposed to being emailed to the user. The persistent connection is established between the app server and the client.