In 4.0 you can use workflow to send an email. You can configure the workflow from Sitefinity >> Administration >> Workflow. We use Windows Workflow Foundation
and there are the XAML files that you can modify in Visual Studio or another XML editor. The base XAML files are attached.
Another option is overriding OpenAccessLibrariesProvider and its CreateImage/CreateDocument method which is triggered when you upload a new image/document.
the Telerik team
Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items