Understanding Email - POP IMAP Exchange Google SMTP etc

Here's a picture to try and help understand what the different Email configurations mean and how email gets from Sender to Recipient

Understanding Email POP IMAP Exchange SMTP

https://docs.google.com/drawings/d/1fM4dPXAO6ouo8ZRNoGBgpFpQXvEAfdOMq0XYyFK7xXc/edit

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