Normally this means termination of the account. If you send complaints to the wrong people this can do more harm than good. They are ready to forge just about everything that would reveal their whereabouts. Sometimes the question arises how they expect to be contacted by potential customers. To find out about the source of spam despite all the odds headers are your best friends.
Every email message consists of two parts, the body and the header.
Things are getting difficult and interesting here already since the recipient I mentioned above may not be what is used by the servers transporting the mail to you. Fortunately, we still have our sample to look at and explain things. You should also be sure to know how to display all the headers in your email program. If you haven't done so yet, it may be a good idea to read how the SMTP protocol works . This should provide some insight.