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) Mail access starts with client when user needs to download e-mail from the

3) The underlying Transport layer protocol used by SMTP is

4) Which one of the following is an SMTP server configured in such a way that anyone on the internet can send e-mail through it?

5) Post Office Protocol, version 3 (POP3), has two modes, Delete Mode and