E‑mail is a great way to keep in touch with other people. Unfortunately, it can also open your computer to security risks, computer viruses, and potentially malicious software if you're not careful about the messages and attachments that you open. Before opening any e‑mail message or attachment, be sure that you have an up-to-date antivirus program installed. The antivirus program should be configured to scan messages as they arrive (real-time), and to scan all types of file attachments.
Here are some questions you can ask yourself to help decide whether to open an e‑mail message or attachment.
Do you know the person who sent you the e‑mail message?
Have you received e‑mail from the sender before?
Were you expecting e‑mail from this sender?
Does the subject line or attachment file name make sense?
Before you open any e‑mail that has an attachment, make sure that your antivirus program is up to date and that it's turned on (this allows it to scan attachments).