In any case, another part of the header is less likely to be forged. Consult the mail-reader's documentation, or your Internet Service Provider or system administrator, to find out how to see the complete headers. With Netscape 3.0, pull down the Options menu, choose Headers, and choose All. With the Messenger component of Netscape Communicator 4.0, pull down the View menu, choose Headers, and choose All. In the Pine mail reader, you can hit H while viewing a message to see the full headers, if that option is enabled.
Spammers sometimes put fake headers at the end of a message to cause confusion.
But AOL is virtually the only environment where headers are supposed to show up at the end of a message, and even there you should be able to find the real headers after the fake ones. This is where it helps to have technical tools for reconstructing the truth behind potentially forged e-mail headers. Although I'll talk about some of these tools in a moment, they may require more expertise than most people have. Non-technical people may wish to employ another strategy. This field was generated by the mailer at your site, so it is probably reliable.