About 48 percent of all e-mails sent worldwide are unwanted ad or spam mails
, according to security software business Kaspersky. The United States are the biggest source of spam, accounting for 13.2 percent of global spam traffic. China was in second place (11.3 percent) with Vietnam and China sharing third place (6.1 percent). The positive outlook being that the proportion of spam in e-mail flows steadily deacreases.