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How does Email work?
You may find the following link with animation useful before you attempt the following test. There are a few technical and complicated terms like SMTP, client, server, POP3, etc, that you will come across.
https://mocomi.com/how-does-email-work/
You may also find the following overview useful: https://www.swipetips.com/email-basics/ (this is to do with using emails and how it works in that respect)