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Which of the following would be used to send messages using the SMTP protocol?

  1. Email software

  2. Firewall settings

  3. Wireless access points

  4. Network cables

The correct answer is: Email software

Sending messages using the SMTP protocol requires the use of email software, as this protocol is specifically designed for email transmissions. Firewall settings, wireless access points, and network cables are not specific to email and therefore would not be appropriate for sending messages through the SMTP protocol.