Contact your local moderator and forward the email to them at their email address. Make sure the headers and footers are included allowing the IP address to show for tracking purposes. Pepper is a wise advisor.
Note: If you are getting that message via private mail (i.e. aol/yahoo/gmail/etc.) you may not be able to get all of the meaningful information to track the source.
Example is Hotmail. They dropped that option a long time ago.