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GATE CSE 2012 | Question: 22

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Which of the following transport layer protocols is used to support electronic mail?

  1. $\textsf{SMTP}$
  2. $\textsf{IP}$
  3. $\textsf{TCP}$
  4. $\textsf{UDP}$
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54 votes
54 votes

The answer is option C: TCP.

There are three primary TCP/IP protocols for E-Mail management:

  • Post Office Protocol $\textsf{(POP)}$
  • Simple Mail Transfer Protocol $\textsf{(SMTP)}$
  • Internet Message Access Protocol $\textsf{(IMAP)}$

They all are Application Layer Protocols

Once a client connects to the E-mail Server, there may be $0$(zero) or more $\textsf{SMTP}$ transactions. If the client has no mail to send, then there are no $\textsf{SMTP}$ transactions. Every e-mail message sent is an $\textsf{SMTP}$ transfer. 

$\textsf{SMTP}$ is only used to send (push) messages to the server. $\textsf{POP}$ and $\textsf{IMAP}$ are used to receive messages as well as manage the mailbox contents(which includes tasks such as deleting, moving messages etc.).

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TCP is used in transport layer to carry out mail which is iniated by application layer protocol SMTP.

So correct option will be -TCP

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