Which command allows a technician to ensure that the email service is running on the server?

The command that allows a technician to ensure that the email service is running on the server is netstat. This command provides a way to view network connections, including active TCP and UDP connections, port information, and listening services on the machine. By using netstat, a technician can check if the email service, which typically operates on specific ports (like port 25 for SMTP or port 993 for IMAPS), is actively running and accepting connections.

The other options serve different purposes: ifconfig and ipconfig are used for network interface configuration and displaying the current network configuration details of the server or device. Nbtstat is specifically used for troubleshooting NetBIOS over TCP/IP networking and does not provide information about the status of email services. Thus, using netstat is the appropriate choice for confirming the operational status of the email service on the server.