I have noticed over the last month that I have been receiving mail delivery failures for addresses that I have never mailed to.
I changed my sending instructions on my Zone Alarm and Outlook Express to send only 1 email at a time and to hold them in my outbox until I click the send/receive button.
I have been finding mail in the out box that says it is being sent by my address but it is not mine.
How do I stop this?
I have run my Zone Alarm virus sweep and spyware sweep and my Webroot Spysweeper and that doesnt seem to turn up anything.

Operating System:Windows XP Pro
Product Name:ZoneAlarm Internet Security Suite
Software Version: