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Email delivery uses two types of protocols. The first is made of a single protocol, SMTP. The second type includes POP3, IMAP, Exchange, HTTP,

Email delivery uses two types of protocols. The first is made of a single protocol, SMTP. The second type includes POP3, IMAP, Exchange, HTTP, etc. which are used for accessing email. Why do we need both types? Can one build an email system using only one of the two types?

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