How to find the source of the viruses in the virus chest?

We are a non-profit running Avast Business Security (free). Is there a way to find out where all the quarantined viruses (MW97:Kukudro-A) are coming from? I think it’s someone’s hijacked e-mails, but I guess the messages are being quarantined as well. I get my e-mails through Outlook but can blacklist the e-mailer at the Gmail level if I knew who was sending the infected e-mails.

Thanks!

from the detection name given MW97:Kukudro-A as you say most likely a mail attachment, as it is a word exploit

Microsoft call it Virus:W97M/Kukudro.A!CME-745
info here http://www.microsoft.com/security/portal/threat/encyclopedia/entry.aspx?Name=Virus%3AW97M%2FKukudro.A!CME-745