A week ago I sent an email to more than 50 colleagues. I have their contact information in my Filemaker database, so I automatically created the messages from this application which transfer them to Entourage and sent from there. The problem is that somehow during the process, a hijacker got my connection and sent SPAM using my email account. I realized this when I started receiving many system notifications of returned mail I have not sent. I have the Firewall activated, which comes with the system, and it allows only for Personal File Sharing and Printer sharing. Also, the Internet Sharing is off. Can anyone help me prevent this from happening again?