Someone Hack my Email Server for Spam

I'm Using Imail 6.06 Email server.
Recently I find my Win2k Server is extramely Slow. So I decided to check out what cause it. I find out that my C:\ was only have around 300MB Free Space left which I assign 384MB for Swap.
I Try try track down which program took up all the resource. I found out that it's from Imail Log file.

somehow people able to use my Email Server to spam junk mail.
I don't know how they were able to do it. ( They are not using any of my User account ) The Send Address doesn't belong to my Domain. My Imail Server is only set to relay email for Local user.

Now I disable my Email server entirely until I can get this fix.

What should I do? I hate to let someone use my email server to spam people.
Please Help.

 

 

 

 

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