Yes but if there is no filter for the functions.php could you please at least let me know the word/line of code that I have to delete in the core files?
Your plugin is the only one of all my plugins that adds a reply to address without letting users change it .A reply to address only makes sense when you can use a different address for that. Otherwise it doesn’t make sense at all because people use noreply addresses these days for the “from”. Look at your own support forum emails, which also reply to a “noreply” address. That’s not how it should be.
To open a new support ticket, first select the relevant forum and then click the "New Post" button. Example: You need support for the core plugin? Click on Core Plugin support and click on the "New Post" Button.