People can fake your email address and send fake emails from your account. They have a email sender that lets them specify which “from” to include.
This is pretty common and there is nothing you can do about it. However if you look at the complete header information for the email and compare it to yours it will be different. If the original header isnt different, then yes, you have a security breach, but I doubt it, as this is a pretty common problem.
Thank you Caesar. I do believe after some thorough research that the problem I had today was a Microsoft issue. The bad emails being sent were because my HOTMAIL account had been hacked and the vacation message had been activated. It appeared to some people visiting my blog that the message came from there because we have also communicated off-line via my webmail.
I am in the process of running a full-scan to check for any worms but so far it appears this was a fluke and had nothing to do with WP afterall.
