The specification that limits the size of files that can be included with electronic messages is a crucial parameter. For example, a user might encounter an error message if attempting to send a video file that exceeds 25 megabytes through a particular email provider.
This limitation ensures the efficient delivery of messages, preventing overload of mail servers and minimizing the risk of network congestion. Early email systems had very small limits, reflecting the technological constraints of the time. As technology evolved, those limits gradually increased, although variations persist among different services.