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Which server cannot be used to receive emails directly?

  1. IMAP server

  2. POP3 server

  3. SMTP server

  4. MDA server

The correct answer is: SMTP server

The SMTP server is designed for sending emails rather than receiving them. It stands for Simple Mail Transfer Protocol, and its primary function is to facilitate the transmission of outgoing messages from a client's mail application to an email server and then to the recipient's mail server. In contrast, IMAP (Internet Message Access Protocol) and POP3 (Post Office Protocol) servers are specifically structured to retrieve and store incoming emails for users. An MDA (Mail Delivery Agent) server also plays a role in the receiving and processing of emails, often delivering messages to the user's mailbox. This distinction in functionality clarifies why the SMTP server cannot directly receive emails while other types of servers are built for that purpose.