added missing config field in-reply-to

src/email.rs

@@ -51,6 +51,11 @@ pub const CONFIG: CfgGroup<'static> = CfgGroup {
             default: "error: no toc saved",
             description: "Recipient of the emails sent.",
         },
+        CfgField::Default {
+            key: "in-reply-to"
+            default: "intern@berlin.ccc.de"
+            description: "Person to reply to"
+        }
     ],
 };