The underlying Transport layer protocol used by SMTP is
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1) Post Office Protocol, version 3 (POP3), has two modes, Delete Mode and
2) When the mail server sends mail to other mail servers it becomes ____________
3) User agent does not support this
4) Which one of the following is an SMTP server configured in such a way that anyone on the internet can send e-mail through it?
5) Typically the TCP port used by SMTP is