Question: The POP3 Post Office Protocol only allows a client to retrieve email, using a password for authentication. Traditionally, to send email, a client would simply

The POP3 Post Office Protocol only allows a client to retrieve email, using a password for authentication. Traditionally, to send email, a client would simply send it to its server and expect that it be relayed.

(a) Explain why email servers often no longer permit such relaying from arbitrary clients.

(b) Propose an SMTP option for remote client authentication.

(c) Find out what existing methods are available for addressing this issue.

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a Email servers often no longer permit relaying from arbitrary clients for several reasons primarily due to security considerations 1 Spam Prevention ... View full answer

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