The first option that you have is to use content filter for the HTMLField. Please find attached a sample implementation of this content filter
(slightly modified to show the real content in design mode and capital case on the frontend) on our HtmlField template. I have verified the sample to be working on both Content Block widgets and in Content modules using HtmlField.
The other option is to use ReCaptcha
. It offers a simple email obfuscation service
. Furthermore, you could review the following article
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