If you do not know what IP's are, then do not worry about it.
If you still wanna know, mail headers is the hidden system information that every email has. In Outlook Express, those headers can be seen in email's properties. In Opera's M2, you can see the headers by clicking on "Display All Headers"...
Those headers are generated by the servers through which the email passes, including the one you send mail with, the one your receive mail with and any intermediate servers that may be on the way...
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