I'm using a controller with .net.mail mailmessage to send a form from the homepage. I also have a field on my content template page for user to fill in their email address with the intention of that being the email to be sent to. What's best practice with Umbraco to allow the receiver email address to be dynamically changed by this textbox in Umbraco back office?

Alternatively, is there markup to use umbraco system admin email address to be used as the mail message to ?