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How an email server works
https://www.makeuseof.com/tag/technology-explained-how-does-an-email-server-work/
What happens to an email when you press "send"?
SMTP
IMAP and POP3
Additional Reading
https://www.techwalla.com/articles/what-is-email-protocol
'https://www.siteground.com/tutorials/email/protocols-pop3-smtp-imap/