Several times in the past few months I have sent out emails to people on my address book, which I did not intentionally send. It was clearly some sort of virus . The question was whether it resided on my iMac or something was getting into my AOL email account. Each time I changed my AOL password. A few months ago around 50 faxes were sent by me to people in my address book through my Internet fax service. All of the faxes consisted of nothing but my fax cover sheet. I changed my email password again. Just today 5 bogus faxes were sent. I went to my fax provider and they said I probably had a trojan horse or something affecting my Mac Mail Server. I just went to my AOL account and they do not show any of those emails sent through the Internet. So, I get an email from the fax service on my act that there was an unsuccessful fax sent, but no indication of the sent faxes. Is it possible my iMac is infected? If so, what program would you suggest to detect this and clean it?