Email Tracker Pro
The program traces an email back to its true point of origin, shows you the IP address and location of the sender, and tells you whether the email header was tampered with in order to fool you. In addition, it provides contact information for the domain from which the email was sent so that you can report any abuse.
In order to use Email Tracker Pro, you?ll have to copy the headers from an email into the program. Note that the headers aren?t the ?Subject? line, ?From? line, and so on. Instead, they?re usually hidden. How you find them varies according to your email software. For example, in Outlook 2007, right-click an email, select Message Options, and you?ll see an Internet headers field.
The program says that it integrates directly into Outlook, although I was unable to integrate it with Outlook 2007.