E-mails are one way to send information in a fast and safe manner. We can classify the e-mails into two categories. The first category e-mails are those that are useful mails from our friends, relatives and business related mails. The second category e-mails are useless mails that are sent through virus programs. No one likes to have these unnecessary mails stored in their inbox. These mails are usually referred as junk mails or spam mails. Many people think that it is a tedious process to find and destroy the junk mails. But that is not the case. We can make use of softwares to prevent spam mails from entering our inbox. One such software is Mozilla Thunderbird, which can be downloaded for free.