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) SMTP is used to deliver messages to

2) Typically the TCP port used by SMTP is

3) SMTP defines

4) When the mail server sends mail to other mail servers it becomes ____________

5) The underlying Transport layer protocol used by SMTP is