Fix create user tests

Author: adimiz1

cloudinary-test-common/src/main/java/com/cloudinary/test/AbstractAccountApiTest.java

@@ -422,19 +422,19 @@ private ApiResponse createUser(List<String> subAccountsIds, Boolean enabled) thr
     }
 
     private ApiResponse createUser(List<String> subAccountsIds, Account.Role role) throws Exception {
-        String email = String.format("%s@%s.com", randomLetters(), randomLetters());
+        String email = "sdk+" + SDK_TEST_TAG + randomLetters() + "@cloudinary.com";
         return createUser("TestName", email, role, subAccountsIds);
     }
 
     private ApiResponse createUser(List<String> subAccountsIds, Account.Role role, Map<String, Object> options) throws Exception {
-        String email = String.format("%s@%s.com", randomLetters(), randomLetters());
+        String email = "sdk+" + SDK_TEST_TAG + randomLetters() + "@cloudinary.com";
         ApiResponse user = account.createUser("TestUserJava"+new Date().toString(), email, role, null, subAccountsIds, options);
         createdUserIds.add(user.get("id").toString());
         return user;
     }
 
     private ApiResponse createUser(List<String> subAccountsIds, Account.Role role, Boolean enabled) throws Exception {
-        String email = String.format("%s@%s.com", randomLetters(), randomLetters());
+        String email = "sdk+" + SDK_TEST_TAG + randomLetters() + "@cloudinary.com";
         ApiResponse user = account.createUser("TestUserJava"+new Date().toString(), email, role, enabled, subAccountsIds, null);
         createdUserIds.add(user.get("id").toString());
         return user;