When the sender and the receiver of an email are on different systems, we need o

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

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

2) Example of user agents for e-mail

3) SMTP is used to deliver messages to

4) SMTP uses the TCP port

5) User agent does not support this