other malware, usually the mass email worms that enter via an attachement to spread. you need to identify which one it is by either updated virus scans with your software AV or an online scan or two, here is a link that can help you to those under the FREE Online AntiVirus/Malware Scanners section.
Here's the scenario. A Yahoo email account had emails forwarded from the inbox, which the user did not send. They were sent to all the contacts in the address book. Could a virus forward emails? If it was a virus, could the virus forward a select few messages? All the messages? If there was a virus, then theoretically the recipients anti-virus program would have caught them. This did not happen, so I'm assuming it was not a virus but a hacker. Your thoughts? I'm just curious to know if a virus could do such things. Or if it was a hacker. The email account in question was checked by Yahoo, verified no virus present, and the password was changed. Thanks for your help.