Email is the most vulnerable service intruded by ‘uninvited guests’. That’s what Google suggests to the email user to always change the password two times a year.

Most Internet users now had to be increased awareness against spam messages because fraudsters increasingly focused on popular web services like Gmail, Facebook, Yahoo, and Hotmail.

They will go into email account and then send a message to the victim through the contacts, hoping that spam would be more effective because it comes from a friend.

“People are far more likely to respond to a message from someone they know,” said Andrew Brandt, a researcher internet threat from Webroot, as reported by PC Advisor.

Spam may include links to sites of pharmaceutical fraud, fake phishing page, or demand for money. In one scam that has been running for over a year now, cyber criminals pretended that he was trapped in a foreign country and ask friends of the victims to help fund.

Victims usually do not know how their accounts tampered with, but according to Google there are several ways this can happen. Username and passwords are often stolen in a phishing attack, or by malicious software that records their personal information.

Sometimes the criminals hacking into Web sites associated with a Google account.

“If you hack site and sign-in information is found, the hijackers have easy access to a Google Account,” writes Priya Nayak, one of the Google officials.

And sometimes the bad guys just guessed right. “You use a password that is easy to guess, such as first or last name plus your birth date (‘Laura1968′), or you provide the answers to secret questions are common and predictable, such as pizza, on favorite food,” he said.

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