Electronic Mail Security

Write a few words about Email threats briefly and

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Answer in brief for below

• 1 What is the difference between RFC 5321 and RFC 5322?
• 2 What are the SMTP and MIME standards?
• 3 What is the difference between a MIME content type and a MIME transfer encoding?
• 4 Briefly explain base64 encoding.
• 5 Why is base64 conversion useful for an e-mail application?
• 6 What is S/MIME?
• 7 What are the four principal services provided by S/MIME?
• 8 What is the utility of a detached signature?
• 9 What is DKIM?