The feature allow you reply any email address in a message which submitted from customers or guests. The feature just work when the message have email form field
Reply Email
Go to Admin Panel > LandOfCoder > Manage Messages
Edit the message which you want
Click on tab “Reply Email”
Then choose Email To – The dropdown will auto get list email address which was submitted on the message. And input some content as you want, then click on “Send Email” on bottom