What are the risks of receiving an email?

If you don't know who is sending the email, it could be spam, which is a pain, but more importantly, if you don't know who it is who sending it, don't open it! If you open a unfamiliar person's email, it could very well have a virus that could screw up your computer and fast. Viruses also can be downloaded to your computer if you have that preview option on your email window! So watch out!