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) There are Four Scenarios in

2) Example of user agents for e-mail

3) Typically the TCP port used by SMTP is

4) SMTP connections secured by SSL are known as

5) When the mail server sends mail to other mail servers it becomes ____________