Expansion of SMTP is
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1) When the sender and the receiver of an email are on different systems, we need only _________
2) User agent does not support this
3) When the mail server sends mail to other mail servers it becomes ____________
4) Simple mail transfer protocol (SMTP) utilizes _________ as the transport layer protocol for electronic mail transfer.
5) 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?