Add sender id as $user_id, validate if user exists.

main/auth/inscription.php

@@ -844,7 +844,8 @@ if ($form->validate()) {
                         MessageManager::send_message_simple(
                             $bossId,
                             $subjectEmail,
-                            $contentEmail
+                            $contentEmail,
+                            $user_id
                         );
                     }
                 }

main/inc/lib/message.lib.php

@@ -168,17 +168,24 @@ class MessageManager
             if (!empty($result[1]) && !empty($userInfo)) {
                 $message[1] = '<a '.$class.' href="view_message.php?id='.$result[0].'">'.$result[2].'</a><br />';
                 $message[1] .= $userInfo['complete_name_with_username'];
+                $message[3] =
+                    Display::url(
+                        Display::returnFontAwesomeIcon('reply', 2),
+                        $newMessageLink.'?re_id='.$result[0],
+                        ['title' => get_lang('ReplyToMessage') ]
+                    );
             } else {
                 $message[1] = '<a '.$class.' href="view_message.php?id='.$result[0].'">'.$result[2].'</a><br />';
-                $message[1] .= get_lang('UserUnknow');
+                $message[1] .= get_lang('UnknownUser');
+                $message[3] =
+                    Display::url(
+                        Display::returnFontAwesomeIcon('reply', 2),
+                        '#',
+                        ['title' => get_lang('ReplyToMessage')]
+                    );
             }
 
-            $message[3] =
-                Display::url(
-                    Display::returnFontAwesomeIcon('reply', 2),
-                    $newMessageLink.'?re_id='.$result[0],
-                    ['title' => get_lang('ReplyToMessage') ]
-                ).
+            $message[3] .=
                 '&nbsp;&nbsp;'.
                 Display::url(
                     Display::returnFontAwesomeIcon('share', 2),

main/inc/lib/usermanager.lib.php

@@ -568,10 +568,10 @@ class UserManager
                         MessageManager::send_message_simple(
                             $adminId,
                             $subject,
-                            $emailBody
+                            $emailBody,
+                            $userId
                         );
                     }
-
                 }
                 /* ENDS MANAGE EVENT WITH MAIL */
             }