Manual:$wgEnotifRevealEditorAddress

Details
If true, sets the Reply-To: field of an email notification to the email address of the user who made the edit. Allows email notification recipients to quickly reply to the editor of a watched page. Set to false to suppress the page editor's address in email notifications.

To have the user's email address appear in the From: field instead of just Reply-To:, set  .

If   is false, this setting is ignored.