The underlying Transport layer protocol used by SMTP is
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1) Example of user agents for e-mail
2) When the sender and the receiver of an email are on different systems, we need only _________
3) In SMTP, the command to write recievers mail adress is written with this command
4) Simple mail transfer protocol (SMTP) utilizes _________ as the transport layer protocol for electronic mail transfer.
5) Mail access starts with client when user needs to download e-mail from the