This is typically caused by a spam message that was sent using your email address. This is a an attempt to send out spam message using your address listed as the return path. When the spammer sends their message to an invalid email address the bounce message comes back to your account, because they used your address.
This usually happens because your computer or someone who has you listed in their contacts could be infected by a virus.
Some possible solutions to prevent this from happening are:
- Make sure you are up to date with your anti-virus program
- Run a full scan on your computer.
- Also, attempt to notify anyone who has you listed in their contacts to do the same
- Lastly, try to remove any reference to your email addresses from any websites.