The email system component temporarily stores messages prepared for sending. It acts as a queue, holding emails until the system can successfully transmit them to the recipient’s mail server. For example, if a user composes a message and clicks “send” while the internet connection is unstable, the message will reside here until a stable connection is re-established and delivery becomes possible.
This holding area is essential for ensuring that email messages are not lost due to temporary connectivity problems or server unavailability. It provides a buffer, allowing users to continue composing and sending emails without being immediately affected by network issues. Historically, this function became vital as email became more prevalent and users started relying on it for time-sensitive communications.