E-mail clients in personal computers mostly use the POP or the IMAP protocols to download incoming mail. Why do they not use SMTP?

Possible reply

  1. SMTP requires that the receiving program is on-line all the time, and personal computers are sometimes shut down or not running any mail program.
  2. POP and IMAP store incoming e-mail in the server, until the user downloads them.
  3. POP and IMAP identify the user before giving access to the e-mail for this user, which can give better security.

The secret code is Mellom.

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