Simple mail transfer protocol (SMTP) utilizes _________ as the transport layer p

Simple mail transfer protocol (SMTP) utilizes _________ as the transport layer protocol for electronic mail transfer.

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1) A SMTP session may include

2) The underlying Transport layer protocol used by SMTP is

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

4) SMTP is used to deliver messages to

5) User agent does not support this