Some accounts are set-up so that properties link to a branded landing page rather than a website. 
On this landing page contacts can see all the relevant details for the property and are able to submit an enquiry about it, which will be sent as an email.

By default this enquiry will go to the user that sent the email as well as the listing agent.

You can also elect for an additional person (e.g: a team member) to receive this notification as well, by adding them to your Enquiry Notification section within your account Settings menu.