Showing full headers

If you don't see a Received: line in your email headers your mail client is hiding some headers from you. In order to find the source of an email you need to see the full headers

All mail readers have some way of showing fullheaders:

Eudora Light before V3

Select Tools, Options..., then Fonts & Display then Show all headers (even the ugly ones)

Eudora Light (V3+)

Press the BLAH button on the incoming mail message

Netscape 3

Select Options, Show Headers, then All