Malicious virus can generate large amount of email sending out from the infected PC. If the PC is inside your corporate LAN, it can bring down the upload speed of your connection in your office. This means, you might easily get a ‘Can not connect SMTP server’ error message through your email client.
If the virus uses your SMTP to do the attack, your SMTP should have awared of this. In this case, the useful Email report come into the picture

The number of email with virus (the script trying to spread itself to more people in order to launch DoS attack at a same time) captured was relatively high.

Using the name of virus, you can do a tracing of this virus inside your corporate LAN.
The Virus counts that you see in the control panel report are all the email viruses caught by our email system coming into your email boxes. So say a person emails you and there is a virus in their email. Our email filters catch that virus and strip the virus from the email and then it sends it to your mailbox, clean. That number you see is the number of times our email filters have done that for you.