Which command is used to terminate an SMTP session?

The command used to terminate an SMTP session is "QUIT." This command signals to the SMTP server that the client has finished sending commands and is ready to close the connection. When a client sends "QUIT," it ensures a clean termination of the session, allowing both the client and server to complete any final transactions before disconnecting.

Understanding the importance of proper session termination in SMTP is crucial, as ungraceful exits can lead to issues such as resource leaks or incomplete message transmissions. The usage of "QUIT" is standardized in the SMTP protocol, making it the recognized method for ending an SMTP session.