How does an SMTP server respond to command timeouts?

An SMTP server typically responds to command timeouts by closing the connection if no command is received within the specified timeout period. This behavior is important for maintaining server resources and preventing unnecessary loads from clients that may become unresponsive.

When a client connects to an SMTP server, it initiates communication with a series of commands and expects timely responses. If the client doesn't send a command within the designated timeout interval, the server recognizes this inactivity as an anomaly. To efficiently manage its connections and ensure availability for other clients, the SMTP server will terminate the idle connection.

This practice is part of the server's design to ensure it remains responsive and efficient, as it helps reclaim resources that would otherwise be tied up by clients that are no longer engaged.