add email whitelist config

app/Utils/Helper.php

@@ -87,8 +87,11 @@ class Helper
 
     public static function emailSuffixVerify($email, $suffixs)
     {
-        $suffix = preg_split('@', $email)[1];
+        $suffix = preg_split('/@/', $email)[1];
         if (!$suffix) return false;
+        if (!is_array($suffixs)) {
+            $suffixs = preg_split('/,/', $suffixs);
+        }
         if (!in_array($suffix, $suffixs)) return false;
         return true;
     }