At beginning of Internet era, messages sent by electronic mail were short and co

At beginning of Internet era, messages sent by electronic mail were short and consisted of

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

2) In SMTP, the command to write recievers mail adress is written with this command

3) Which one of the following protocol is used to receive mail messages?

4) Typically the TCP port used by SMTP is

5) SMTP is used to deliver messages to