What is the difference between RFC 5321 and RFC 5322?

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      each question 4 to 5 lines 

    • 8.1 What is the difference between RFC 5321 and RFC 5322?
    • 8.2 What are the SMTP and MIME standards?
    • 8.3 What is the difference between a MIME content type and a MIME transfer encoding?
    • 8.4 Briefly explain base64 encoding.
    • 8.5 Why is base64 conversion useful for an e-mail application?
    • 8.6 What is S/MIME?
    • 8.7 What are the four principal services provided by S/MIME?
    • 8.8 What is the utility of a detached signature?
    • 8.9 What is DKIM?

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