"Virus"! your computer is being used to run Spam
2. Eliminate Viruses.
Spam still slips through filters, and sometimes delivers viruses that then turns your computer into a spamming machine without you even knowing. In fact, 90 percent [PDF] of computer viruses deposit an SMTP engine which then sends out spam, unbeknownst to the computer owner. Some of these viruses go yet further, and search your PC for private information and steal company or personal bank account information by emailing it back to the spammer. This could result in lawsuits and/or fines due to email non-compliance with government regulations to protect certain data.