Determining Sends IP Address?

How can we track a senders IP address (to their ISP) that is sending us e-mail? Will only the web host IP show or can we track a user IP address down through their e-mail?

 

I don't think we can track down the users IP since user is using public email service to send emails.

 

What do you mean, shouldn't the IP of the user be listed in the headers of the e-mail?

 

Never mind I see the e-mail headers, I found it. Our computer name, ip address and etc is all listed.

 

You mean all the info about the email sender? :-O

I couldn't get it anywhere. Where you found it?

 

It's in the e-mail headers, if your using Outlook Express it's a bit more difficult to find. Tell me if you need more help.