Junior sales workers commit more security breaches than other employees, according to new research from MessageLabs.

The study, which sought the views of almost 1,000 IT decision makers in the United Kingdom and United States, found that junior sales workers between the ages of 26 and 35 who are multi-taskers and technology savvy are the worst security violation culprits. This group is also likely to use many applications such as email, instant messenger, VoIP and surf the web, the report claimed.

Conversely, those members of staff who are knowledgeable on security issues and work in technology middle-management roles across the same age group are the least likely to break security rules, according to the research.

"Today’s businesses need to be vigilant about both external and internal security threats," said Mark Sunner, chief security analyst at MessageLabs. "With almost half of all businesses not providing adequate training regarding online threats, employees are likely to be oblivious to the dangers to hand and need protecting by other means."

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