Because that's how they're designed to work.
When you open an email containing a virus - it's first 'task' is to replicate itself as many times as possible. Not only will it infect your own computer but, using your email address book, it'll try to send itself to each of your contacts. The problem is - people receiving an email from you will not normally worry about it - as you're known to them.
This makes email viruses easier to spread than those hidden in web pages.
Virus Hoax
Virus Hoax
The person usually receives an email that ends in .vbs. Once the email is opened the virus infects your computer and immediately begins to replicate and emails itself to all of the email addresses found within an email address book.
virus hoax
The Anna Kournikova Virus sends itself to your Outlook page. When clicked, it sends copies of itself to all of the people in your address book.
Some email attachments contain viruses and can damage your computer and your data. You need to maintain good internet security practices and be extremenly caution about opening attachments which you are not expecting, or when you have doubts about the origins, or the sender.
The I Love You virus was delivered to people in the form of an email with the subject line saying I Love You. This was a worm that activated visual script and sent itself to everyone in your address book. It shut down servers, mail systems, and government offices to name a few. A symptom was crashing of the computer.
Yes, except if you have a email virus scanner. But even then there is a slight risk. You can always get your virus software to selectively scan the email.
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how do you verify your email address it may be because you have a virus, or the computer froze up. just reboot, or run a virus scan, and try again
Its an email virus... Many e-mail viruses now use random e-mail addresses from an infected computer's address book in the FROM and TO fields of messages the virus sends. Most likely the virus on someone else's computer has found your e-mail address in an address book and used it in the FROM field as the virus replicates itself via e-mail. The messages look like they came from you, but they did not. This is called e-mail spoofing.
The Anna Kournikova Virus was a worm that spread by email, disguised as an email attachment with the filed name "AnnaKournikova.jpg.vbs." The virus was a Visual Basic script that, once opened, emailed itself to all the contacts within the user's Outlook address book. Anna Kournikova was a payload-free virus, however, and did not erase any files or send information back to the creator. (http://www.techopedia.com)