The underlying Transport layer protocol used by SMTP is
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1) NVT Stands for
2) An email client needs to know the _________ of its initial SMTP server.
3) At beginning of Internet era, messages sent by electronic mail were short and consisted of
4) When the mail server sends mail to other mail servers it becomes ____________
5) Post Office Protocol, version 3 (POP3), has two modes, Delete Mode and