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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 MTA(d) Two UAs and two MTAs |
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Answer» The correct option is (d) Two UAs and two MTAs For explanation I would say: The sender’s User Agent (UA) submits the message to a Message Transfer Agent (MTA). Then the MTA sends the message to another MTA i.e. a mail relay. Then the receiver receives the message from the mail relay whenever it is available. |
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