Vietnam ranked ninth in the list of countries sending the most junk e-mails in the third quarter of this year, US-based Internet security company Sophos said.
Spam originating in Vietnam accounted for 3.4 percent of the world's unwanted commercial mails between July and September, Sophos's news website Naked Security said quoting the company's latest "dirty dozen" report.
But the rate was down from 5.8 percent in Sophos's Q2 report which had placed Vietnam in fifth place.
India has topped the charts for the third quarter in a row, with the rates of spam increasing each time.
The country, which has the world's third highest number of Internet users, was the origin of some 16.1 percent of the global spam in the third quarter. In the first and second quarters, the rates were 9.3 and 11.3 percent respectively.
Last year the US had been the worst offender, but it ranks third in the latest list.
Earlier Symantec, another US-based computer security company, said that spam was on the rise in Vietnam, with the ratio of junk mails to total emails rising from 66 percent in July to 71.1 percent in August and 73.2 percent in September, news website VnEconomy reported Wednesday.
It also warned of an alarming increase in emails with hidden viruses. In fact, one in every 246.1 emails in Vietnam contained viruses compared to the earlier 349.
The government recently issued a decree cracking down on spam SMSs and emails.
Under the decree to take effect on January 1, advertisers are not allowed to send an email with the same content to a phone number or email address more than once within 24 hours.
They also need to send a copy of the email to the Ministry of Information and Communications' designated server.
Advertisers have to stop sending emails immediately if a recipient sends an email refusing to accept advertising messages.
Violators can be suspended from online advertising for one to three months, or even permanently.
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