Why is it bad？
Let such mail which neither direct mail nor doubtful invitation has the value to read, and is sent to a target on the other hand regardless of a receiving person's convenience also having not asked, either be a wicked troublesome act. (Since the charge of communication becomes a receiving person's burden)
The side which receives is not only troubled, but on the Internet, "unnecessary mail" will overflow and SPAM mail will cause a kind of traffic congestion, in order to send a lot of electronic mails at once. A server becomes unable to be able to process mail, is downed (functional stop), and it will become impossible for mail really required because of this traffic congestion to become unable to arrive easily, or to receive mail, in being the worst. It seems that recently, traffic congestion has occurred too by the user who continue increasing in number although it seems that the circuit became thick in order to prevent traffic congestion.
Recently, the mischievous mail by the I mode is in fashion. Before knowing, calling it a mental test by a certain mail, a wicked thing which is automatically notified to the police or fire fighting is. There is another thing same as the above by the homepage. Let's be careful.
For this reason, a burden will start the network and apparatus of the Internet and it will stop depending on the case.
For trivial information, let's apply an unnecessary burden to a network, or consider that there are those who receive trouble by the false rumor which confused and flew.
The mischievous mail between rather famous friends turns into a chain mail, settlement comes to be hard for attaching, and it will become troublesome if it flows by the chain mail even if it is the useful information which is not a false rumor even if.