It may not nescessarily mean your acount was hijacked, it could be that your address book was swiped, or someone who you exchange email with regularly had their address book swiped, and the address is being spoofed.  The only way to be sure is to check the full headers of the email.  In the headers is the origin path, and the return path.  If your email address is only listed in the return path, then someone is using an email spoofer and has your email address on the list (probably swiped from a hijacked address book or account).  If your email address is in BOTH fields, then your account was hijacked.

The lines to look for in headers are:

Return Path: (the address replies and failure notices go to)

X-Originating IP: (the IP of the actual sender - still may be spoofed)

Authentication-Results: (shows every address and router it passed through)

Received: (may have more than one of these - the last one is the actual origin)

From: (the address the email alleges to be from - may be entirely different as well)

There will be a lot of other gobbledegook in the headers too, don't worry about most of that.  The lines above will always help you determine if your email has been compromised when you start getting failure notices for emails you never sent.

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