While the other threads in this part of the forum explain how to retrieve the header informations this (http://www.pobox.com/headers.mhtml) site is very useful in learning how the header informations should be read.
Here are two pages that are even better:
http://www.haltabuse.org/help/headers/ How to get full headers in your software (with a lenghty list of clients/email providers)
http://www.haltabuse.org/help/header.shtml How to find and read full email headers.
By the way, www.haltabuse.org is a great source for online safety in general.
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