smtp email not working, from yesterday email not working

smtp email not working

Versions:
WordPress: 6.2.2
WordPress MS: No
PHP: 7.4.33
WP Mail SMTP: 3.8.0

Params:
Mailer: smtp
Constants: No
ErrorInfo: SMTP Error: Could not connect to SMTP host. Failed to connect to serverSMTP server error: Failed to connect to server Additional SMTP info: php_network_getaddresses: getaddrinfo failed: Temporary failure in name resolution
Host: smtp.office365.com
Port: 587
SMTPSecure:tls
SMTPAutoTLS:bool(true)
SMTPAuth:bool(true)

Server:
OpenSSL: OpenSSL 3.0.2 15 Mar 2022
Apache.mod_security: No

Debug:
Email Source: WP Mail SMTP Mailer: Other SMTP SMTP Error: Could not connect to SMTP host. Failed to connect to serverSMTP server error: Failed to connect to server Additional SMTP info: php_network_getaddresses: getaddrinfo failed: Temporary failure in name resolution

SMTP Debug:
2023-07-24 06:48:42 Connection: opening to smtp.office365.com:587, timeout=300, options=array()
2023-07-24 06:48:42 Connection failed. Error #2: stream_socket_client(): php_network_getaddresses: getaddrinfo failed: Temporary failure in name resolution [/var/www/html/wp-includes/PHPMailer/SMTP.php line 389]
2023-07-24 06:48:42 Connection failed. Error #2: stream_socket_client(): unable to connect to smtp.office365.com:587 (php_network_getaddresses: getaddrinfo failed: Temporary failure in name resolution) [/var/www/html/wp-includes/PHPMailer/SMTP.php line 389]
2023-07-24 06:48:42 SMTP ERROR: Failed to connect to server: php_network_getaddresses: getaddrinfo failed: Temporary failure in name resolution (0)
SMTP Error: Could not connect to SMTP host. Failed to connect to server

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