A few days ago, I received about 15 email messages informing me that for various reasons, messages I had sent (using Outlook 2010) had not been delivered. I had not sent any of these 'undeliverable' messages. There were no suspicious emails in my sent mail folder. I previewed some of these emails to see the mail route, and saw that my email address appeared in 'envelope-from', 'message-ID' and 'Return-Path' fields. Quite apparently some-one has used my email address in these emails.
Please note that I have a limited understanding of how email systems work. I wonder if my email address is being used as the 'from' address in emails that have been sent successfully. Is this possible? Is there anything I need to check at my computer to prevent this happening again, or is it all happening remotely from me and there is nothing I can do about it?
My system is a Dell SXPS 1340 laptop with Outlook 2010 running on a WIndows 7 64 bit operating system. Also running Kaspersky 2010 Internet Security Suite with email checking enabled.