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At every connection the user's host gets from the ISP an IP address assigned dynamically. When the user is offline, composed messages must be queued on the local host, without activating a connection to the Internet. Messages sent to local users must be delivered immediately. 2.2 Software environment Some words about the tools I have used to test what I'm going to explain. Tests have been done under Linux with the Debian and the Red Hat distributions, both for the i386 platform, using 2.0.x and 2.2.x kernels.