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

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in Computer Network by (190k points)
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

The question was asked during an interview.

My doubt is from SMTP topic in chapter Application Layer of Computer Network

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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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