In EMAIL, We need two VAs and two pairs of MTAs, When sender is connected to mai

In EMAIL, We need two VAs and two pairs of MTAs, When sender is connected to mail server via

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

2) Expansion of SMTP is

3) SMTP defines

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

5) SMTP uses the TCP port