Safe Email usage habits:

• Attachments: Don't open attachments even when email appears to be from someone you know..only open attachments you are expecting to receive, and then only do so if you know you are running anti-virus with updated virus definitions.
• Jokes: Don't exchange or open email JOKES ... virus writers know these are popular and seed joke email lists with viruses
• Phishing: Ignore emails that claim to be security notices from (Paypal, Ebay, "your network administrator", your bank, your ISP)..unless the email provides a non-Internet way to verify it's validity (e.g. by a phone call)...when verifying do NOT trust the phone number in the email, get the customer service number from a trusted location (the entities web site, your account statement, etc.)
• Phishing: Do not follow web links you receive via email...the way the link is displayed (e.g.: www.citibank.com) may not be the site you will be taken too when you click on it (e.g. www.citibankphish.com).
• Phishing: Legitimate emails will usually contain information that only a company that does business with you would know (e.g. your full name, last 4 digits of your account number, etc..)
• Chain letters: Don't foward chain letters...they are scams to allow spammers to harvest email addresses
• Spam unsubscribe links: Never, ever, ever follow a spammers unsubscribe link...you are only confirming that your email address is valid and worse web site could contain malicious code which infects your system
• Spam: Don't ever buy anything advertised via spam...spam only continues because enough people do