When the sender and the receiver of an email are on different systems,

1.	When the sender and the receiver of an email are on different systems, we need only _____________.
A.	one MTA
B.	two UAs
C.	two UAs and one pair of MTAs
D.	none of the above
Answer» D. none of the above

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When the sender and the receiver of an email are on different systems, we need only _____________.

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