When sender and receiver of an e-mail are on same system, we need only two

When sender and receiver of an e-mail are on same system, we need only two

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1) Expansion of SMTP is

2) There are Four Scenarios in

3) FTP uses services of

4) Which of the following is a correct format of Email address?

5) When the sender and the receiver of an email are on different systems, we need only _________