Spammer enhances guessing for e-mails by domain name

Using specialized software, spammers can send mass messages to multiple addresses. Thanks to the e-mail notification mechanism (Failure Delivery), they will know which mailboxes exist and immediately move to the database.

Scott Petry, technical director at Internet Postini (UK), said attacks with the aim of stealing corporate e-mail lists have increased by 30% in August. only legal is a "start-up" step for cybercrime to spread spam, deceive security tools and compose virus exploiting systems.

According to Petry, when an attacker spreads spam, a large number of e-mails sent by the company's address can cause a denial of service and crashes the internal e-mail server system. Postini blocked 23 million messages containing viruses, about 0.45% of the e-mails they visited last month.

British security firm Sophos has also discovered a trick to gather new e-mail. A "ghost" research company called Gemma pretended to launch a survey on Internet spam with the content: " Our project will start next year and the company needs at least 500,000 forward visits to So, please send this message to your friends as much as possible . "

By encouraging e-mailing to others, the company held thousands of e-mails that the user had forwarded.

Guy Roberts, an expert with McAfee, said that the spam-like war of cat and mouse is because the spammer is "holding on to it", which could change the URL much faster than the response speed of security company.