Security: Email Security: 10 Steps for Dealing With Dangerous Messages
Attachments From Unknown Sources
Don't open them. The messages often are loaded with language designed to encourage the recipient to open the attachments, which could be loaded with malware that automatically downloads onto the computer. The basic rule of thumb: If you don't know the sender, don't open the attachment.
The recent success authorities have had in taking down dangerous botnets has helped drive down the amount of spam flooding into business and consumer email accounts. In a report on security in 2011 released late last year, Cisco Systems found a "steep decline" in the volume of spam since August 2010, with the number of spam messages falling from 379 billion a day to 124 billion. And the picture was pretty good in the United States, which dropped from being the No. 1 source for spam in 2010 to No. 9 in 2011, according to Cisco. The amount of money generated annually from spam also was cut in half, dropping to about $500 million. However, that doesn't mean that the security threat from spam is disappearing. According to a survey released in March by GFI Software,