Circulation of NDR-spam has rocketed 2000 percent, according to a new study.
Internet security group PandaLabs has noticed the significant increase by comparing current Spam volumes to the average recorded between January and June this year.
NDR spam is the process of sending out thousands of email massages to random account names. The ones that don’t exist will return an NDR (non-delivery report), meaning that the spammer can then identify the real email addresses from the pile.
Panda Security claims that twenty percent of global spam it monitors uses this technique.
“There is presently no consensus on whether NDRs are a technique to evade anti-spam filters or a collateral effect of dictionary attacks; either way, this technique is now among the most widely used,” says Luis Corrons, technical director at PandaLabs.
Luis adds that there are few PC programs which can block this method of spam, yet the company’s own anti-spam tech allegedly can.