Fix controller

api/src/main/java/be/naaturel/boardmateapi/controllers/EmailController.java

@@ -24,9 +24,9 @@ public class EmailController {
     }
 
     @PostMapping("/mail/send")
-    public ResponseEntity<String> send(@RequestBody Map<String, Object> payload){
+    public ResponseEntity<String> send(@RequestBody String payload){
         try {
-            service.send("laurent0206.cr@gmail.com", "Hello from board mate !", payload.get("content").toString());
+            service.send("laurent0206.cr@gmail.com", "Hello from board mate !", payload);
             return new ResponseEntity<>(HttpStatus.OK);
         } catch (Exception e) {
             e.printStackTrace();