Using Webform Auto Responders for Messaging
This tutorial shows you a process for using a webform’s auto response module as a messaging tool. For instance, on a real estate property listing website having a form at the bottom to directly contact the listing agent.
The key is inserting the email address of the person you want to receive the auto-response email into the forms email address field, rather than the email address of the person filling out the form (this goes into a custom field).
Dave Haggblad