I need you help!

I can’t submit it now, and an error is prompted in the management platform. What should I do?

Versions:
WordPress: 4.9.18
WordPress MS: No
PHP: 5.6.40
WP Mail SMTP: 2.9.0

Params:
Mailer: smtp
Constants: No
ErrorInfo: SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting
Host: smtp.prosperity-textile.com
Port: 465
SMTPSecure: ssl
SMTPAutoTLS: bool(true)
SMTPAuth: bool(true)

Server:
OpenSSL: OpenSSL 1.0.2k-fips 26 Jan 2017

Debug:
Mailer: 其他 SMTP
SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting

SMTP Debug:
2021-07-23 01:43:57 Connection: opening to ssl://smtp.prosperity-textile.com:465, timeout=300, options=array (
)
2021-07-23 01:43:57 Connection: stream_socket_client not available, falling back to fsockopen
2021-07-23 01:43:58 Connection: Failed to connect to server. Error number 2. "Error notice: fsockopen(): Peer certificate CN=<code>*.263.net' did not match expected CN=</code>smtp.prosperity-textile.com'
2021-07-23 01:43:58 Connection: Failed to connect to server. Error number 2. "Error notice: fsockopen(): Failed to enable crypto
2021-07-23 01:43:58 Connection: Failed to connect to server. Error number 2. "Error notice: fsockopen(): unable to connect to ssl://smtp.prosperity-textile.com:465 (Unknown error)
2021-07-23 01:43:58 SMTP ERROR: Failed to connect to server: (0)
2021-07-23 01:43:58 SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting

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