잘 되다가 안되고 있다면

우선 호스팅 측에 메일 발송이 되지 않는데

제한된 부분이 있는지 확인해보셔야 할 듯 합니다.

또 SMTP 설정을 하신 상태라면

SMTP 설정에 문제가 생긴 것은 없는지도

확인 해보시는 것이 좋겠습니다.

고맙습니다.

코드 수정 한 후 debug.log에 작성된 내용 보내드립니다. 확인 부탁드립니다 

[03-Apr-2023 00:42:28] PHP Notice:  Constant WP_POST_REVISIONS already defined in /seobana02/www/wp-config.php on line 108
[03-Apr-2023 00:42:28] PHP Notice:  Constant EMPTY_TRASH_DAYS already defined in /seobana02/www/wp-config.php on line 111
[03-Apr-2023 00:42:31] PHP Deprecated:  The PSR-0 `Requests_...` class names in the Request library are deprecated. Switch to the PSR-4 `WpOrg\Requests\...` class names at your earliest convenience. in /seobana02/www/wp-includes/Requests/src/Autoload.php on line 171
[03-Apr-2023 00:42:31] PHP Notice:  Constant WP_POST_REVISIONS already defined in /seobana02/www/wp-config.php on line 108
[03-Apr-2023 00:42:31] PHP Notice:  Constant EMPTY_TRASH_DAYS already defined in /seobana02/www/wp-config.php on line 111
[03-Apr-2023 00:42:31] PHP Notice:  Constant WP_POST_REVISIONS already defined in /seobana02/www/wp-config.php on line 108
[03-Apr-2023 00:42:31] PHP Notice:  Constant EMPTY_TRASH_DAYS already defined in /seobana02/www/wp-config.php on line 111
[03-Apr-2023 00:42:36] PHP Deprecated:  The PSR-0 `Requests_...` class names in the Request library are deprecated. Switch to the PSR-4 `WpOrg\Requests\...` class names at your earliest convenience. in /seobana02/www/wp-includes/Requests/src/Autoload.php on line 171
[03-Apr-2023 00:42:36] PHP Notice:  Constant WP_POST_REVISIONS already defined in /seobana02/www/wp-config.php on line 108
[03-Apr-2023 00:42:36] PHP Notice:  Constant EMPTY_TRASH_DAYS already defined in /seobana02/www/wp-config.php on line 111
[03-Apr-2023 00:43:15] PHP Deprecated:  The PSR-0 `Requests_...` class names in the Request library are deprecated. Switch to the PSR-4 `WpOrg\Requests\...` class names at your earliest convenience. in /seobana02/www/wp-includes/Requests/src/Autoload.php on line 171
[03-Apr-2023 00:43:15] PHP Notice:  Constant WP_POST_REVISIONS already defined in /seobana02/www/wp-config.php on line 108
[03-Apr-2023 00:43:15] PHP Notice:  Constant EMPTY_TRASH_DAYS already defined in /seobana02/www/wp-config.php on line 111
[03-Apr-2023 00:43:19] PHP Deprecated:  The PSR-0 `Requests_...` class names in the Request library are deprecated. Switch to the PSR-4 `WpOrg\Requests\...` class names at your earliest convenience. in /seobana02/www/wp-includes/Requests/src/Autoload.php on line 171
[03-Apr-2023 00:43:19] PHP Notice:  Constant WP_POST_REVISIONS already defined in /seobana02/www/wp-config.php on line 108
[03-Apr-2023 00:43:19] PHP Notice:  Constant EMPTY_TRASH_DAYS already defined in /seobana02/www/wp-config.php on line 111
[03-Apr-2023 00:43:39] PHP Deprecated:  The PSR-0 `Requests_...` class names in the Request library are deprecated. Switch to the PSR-4 `WpOrg\Requests\...` class names at your earliest convenience. in /seobana02/www/wp-includes/Requests/src/Autoload.php on line 171
[03-Apr-2023 00:43:39] PHP Notice:  Constant WP_POST_REVISIONS already defined in /seobana02/www/wp-config.php on line 108
[03-Apr-2023 00:43:39] PHP Notice:  Constant EMPTY_TRASH_DAYS already defined in /seobana02/www/wp-config.php on line 111
[03-Apr-2023 00:43:40] PHP Deprecated:  The PSR-0 `Requests_...` class names in the Request library are deprecated. Switch to the PSR-4 `WpOrg\Requests\...` class names at your earliest convenience. in /seobana02/www/wp-includes/Requests/src/Autoload.php on line 171
[03-Apr-2023 00:43:40] PHP Notice:  Constant WP_POST_REVISIONS already defined in /seobana02/www/wp-config.php on line 108
[03-Apr-2023 00:43:40] PHP Notice:  Constant EMPTY_TRASH_DAYS already defined in /seobana02/www/wp-config.php on line 111
[03-Apr-2023 00:43:42] PHP Notice:  Constant WP_POST_REVISIONS already defined in /seobana02/www/wp-config.php on line 108
[03-Apr-2023 00:43:42] PHP Notice:  Constant EMPTY_TRASH_DAYS already defined in /seobana02/www/wp-config.php on line 111
[03-Apr-2023 00:43:43] PHP Notice:  Constant WP_POST_REVISIONS already defined in /seobana02/www/wp-config.php on line 108
[03-Apr-2023 00:43:43] PHP Notice:  Constant EMPTY_TRASH_DAYS already defined in /seobana02/www/wp-config.php on line 111
[03-Apr-2023 00:43:52] PHP Notice:  Constant WP_POST_REVISIONS already defined in /seobana02/www/wp-config.php on line 108
[03-Apr-2023 00:43:52] PHP Notice:  Constant EMPTY_TRASH_DAYS already defined in /seobana02/www/wp-config.php on line 111
[03-Apr-2023 00:44:03] PHP Notice:  Constant WP_POST_REVISIONS already defined in /seobana02/www/wp-config.php on line 108
[03-Apr-2023 00:44:03] PHP Notice:  Constant EMPTY_TRASH_DAYS already defined in /seobana02/www/wp-config.php on line 111
[03-Apr-2023 00:44:09] PHP Notice:  Constant WP_POST_REVISIONS already defined in /seobana02/www/wp-config.php on line 108
[03-Apr-2023 00:44:09] PHP Notice:  Constant EMPTY_TRASH_DAYS already defined in /seobana02/www/wp-config.php on line 111
[03-Apr-2023 00:44:57] PHP Notice:  Constant WP_POST_REVISIONS already defined in /seobana02/www/wp-config.php on line 108
[03-Apr-2023 00:44:57] PHP Notice:  Constant EMPTY_TRASH_DAYS already defined in /seobana02/www/wp-config.php on line 111
[03-Apr-2023 00:45:15] PHP Warning:  implode(): Argument must be an array in /seobana02/www/wp-content/themes/hestia/functions.php on line 342
[03-Apr-2023 00:45:16] PHP Notice:  Constant WP_POST_REVISIONS already defined in /seobana02/www/wp-config.php on line 108
[03-Apr-2023 00:45:16] PHP Notice:  Constant EMPTY_TRASH_DAYS already defined in /seobana02/www/wp-config.php on line 111
 

올려주신 내용만으로는 원인을 파악하기 어렵습니다.

정확한 원인을 파악하기 위해 디버그 모드를 활성화해서

어떤 오류 메시지가 표시되는지 확인해보셔야 할 듯합니다.

디버그 모드 활성화 방법은 아래의 링크를 참고해보세요.

워드프레스 에러 확인하기 - 디버그 모드 활성화 방법

오류메시지가 나오면 남겨주시겠어요?

고맙습니다.