Introduction
It's ten o'clock on Monday morning. The boss of the branch office is in a rage. He's been waiting for hours for an important e-mail, and it still hasn't arrived. It can only be the fault of the mail server; it's probably misbehaving yet again. But a quick check of the computer shows that no mails have got stuck in the queue there, and there's no mention either in the log file that a mail from the sender in question has arrived. So where's the problem?
The central mail server of the company doesn't respond to a ping. That's probably the root of the problem. But the IT department at the company head office absolutely insists that it is not to blame. It also cannot ping the mail node of the branch office, but it maintains that the network ...
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