In case you want to disable the http service, but keep your Email, follow the instructions below:
1. Log into myTophost Panel and click on Plesk Login in order to connect to the Plesk of the plan that you are interested in.
2. In the Websites & Domains tab, click on Hosting Settings.
3. In status, click on Change, on the right-hand side of Active.
4. Select the Suspended option, click on Apply and OK. This way, your site will be inactive, but your email service will remain active.