Some people use unsolicited e-mail sent in mass quantities as a marketing technique.
Spam is considered more offensive than regular junk mail that the postman delivers since the sender of regular junk mail pays for the postage, but the recipients of spam must pay for the wasted connection time to download it from the server. Net does not allow its customers to use the service to send spam. The reason is that often some of the recipients take offense and try to retaliate against the sender. This causes all sorts of problems for our staff and for our other customers, adding up to significant wasted time and money. Net's facilities to send spam is grounds for termination of your account.