Which of the following servers would you not place on the DMZ?

The email mailbox servers store and manage users' emails, including sensitive information. Placing such servers in the DMZ is not advisable due to the high risk of exposure to the internet, making them vulnerable to attacks. The DMZ is designed to add a layer of security to an organization's internal network by segregating it from the public internet.

In contrast, internet web servers and proxy servers are often placed in the DMZ as they are designed to handle inbound requests and act as intermediaries between users and the internal network. Email relay servers also typically deal with messages but do not contain sensitive user data like mailbox servers. Since email mailbox servers require the protection of the internal network, they should remain behind the firewall, ensuring that they are safeguarded from direct internet access while maintaining the integrity and confidentiality of stored emails.