Buat table untuk menampung data - https://solusipress.com/menyimpan-data-contact-form-7-pada-custom-table/

gistfile1.txt

CREATE TABLE `wp_123456_contacts` (
  `id` int(11) unsigned NOT NULL AUTO_INCREMENT,
  `full_name` varchar(150) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
  `email` varchar(250) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
  `address` varchar(250) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
  `province_id` char(2) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
  `regency_id` char(4) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
  `district_id` char(7) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
  `village_id` char(10) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
  `subject` varchar(250) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
  `message` text COLLATE utf8mb4_unicode_ci,
  `ip_address` varchar(20) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
  `submit_date` datetime DEFAULT NULL,
  `user_agent` varchar(200) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;