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(POP and IMAP (POP will downloads entire messages to your local device and…
POP and IMAP
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IMAP will only download the message header until the message is opened and will leave the message on the server
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HTTP and HTTPS
hypertext transfer protocol is used for accessing and receiving web pages in the form of HTML files on the internet.
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transport layer
creates the connection between two computer, or "hosts"
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