If you don't have to support pre-2007 Word users, you should use Content Controls as found in the Controls group of the Developer tab. For Word up to 2003, you will have to use Legacy Form fields hidden
This article describes how to use the Send to Mail Recipient command. The instructions apply generally to Office 2007 and later versions, but Microsoft® Word 2013 was used for the specific steps and figures.
What is Send to Mail Recipient?