Helping Google Team to troubleshoot your issue

This is a very good url for helping the Google team to troubleshoot an issue.  It includes sections on

• Common Troubleshooting Questions
  
• Submitting a screenshot
• Submitting Mail Headers
• Unable to Access Your Account (gives verification process for proving ownership to Google.

http://www.google.com/support/a/bin/answer.py?answer=45848&ctx=stdar#D