Make sure that your anti-virus software is up to date. Many viruses and Trojans scan the hard disk for e-mail addresses to send spam and viruses. Avoid spamming your colleagues by keeping your anti-virus software up to date.
Use the firewall included with your operating system, or use a firewall from a reputable company, to avoid your computer being hacked or infected with a worm and used as a spam-sending zombie.
Do not respond to e-mail requests to validate or confirm any of your account details. Your bank, credit card company, eBay, Paypal, etc., already have your account details, so would not need you to validate them. If you are unsure if a request for personal information from a company is legitimate, contact the company directly or type the Web site URL directly into your browser. Do not click on the links in the e-mail, as they may be fake links to phishing Web sites.
Do not click on unusual links. Confirm the sender did send the e-mail if it looks suspicious.
Source : DSD Email Group
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