To unsubscribe from the mailing list of Overthehill.com, it is generally done through their website. Usually, there is an option included in the emails that are sent to you, typically located at the bottom of the message. It may be labeled as "Unsubscribe" or something similar. By clicking on this link, you should be guided through the process of removing your email address from their list.
If you do not see that option, you may want to look for subscription management features on the current web page where you signed up. Additionally, you might find another way to unsubscribe by checking the website's FAQ or help section, where such inquiries are often addressed. If you need further assistance, exploring contact options on the site could also be useful.