1. Don't open e-mail from someone you don't know/trust.
2. Avoid sending sensitive information through e-mail.
3. Never open an attachment from a company/someone you don't know.
4. Never click on links inside e-mails.
5. Use a spam filter.
6. Use anti-virus software.
7. Remember to always log off/signout.
8. Change your password often and don't share it with anyone.