There have been so many stupid nerds who tries to sell their services and send you emails every next day. I thought to report it to Google and sent an email (forwarded the actual mail) to firstname.lastname@example.org and got this reply from them. If you are annoyed of a Gmail Spammer who is sending you too many emails using a Gmail account, you can at least take some action against him.
We understand the urgent nature of your message and recommend that you visit the Gmail Privacy & Security Help Center at
https://mail.google.com/support/bin/topic.py?topic=12784 for immediate assistance.
We’ll investigate your report and may send a warning or discontinue Gmail service for users who violate our policies.
If your issue is not related to abuse, please visit our Help Center at http://mail.google.com/support/ or click ‘Help’ at the top of any Gmail page for troubleshooting tips.
The Google Team