Mail has been hijacked

[PaulW]

My mail account has been hijacked. I know this because I am getting Mail Delivery errors for mail which look like med sales.

How do I stop this from continuing?

I'm using MAIL on a G4 Mac-mini running OSX 10.4.7

[CharlieJ]

what is your mail account provider
Try contacting your provider and tell them about this.
and while your there update your software
if there is a security update this may fix your error

[ElDiabloConCaca]

More than likely, your mail account is secure. One way you can make sure is by changing your mail account password.

What's really happening is that a spammer is using your email address as the return address or somehow spoofing their address on his/her spam emails, and that's why you're getting the failed/returned messages. There's not much you can do about this at all, and does not indicate that your mail account has been "hijacked."