Zoho Smtp is not sending mails

Zoho Smtp is not sending mails

HI Team,

Am  using zoho smtp to send mail. But when i tried to send mail its giving below error.
Plz check the php file in attachment section.

2021-09-01 16:40:52 Connection: opening to ssl://smtp.zoho.eu:465, timeout=90, options=array()
2021-09-01 16:40:53 Connection failed. Error #2: stream_socket_client(): SSL operation failed with code 1. OpenSSL Error messages:error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed [F:\xampp\htdocs\mobiletopup\SMTP.php line 392]
2021-09-01 16:40:53 Connection failed. Error #2: stream_socket_client(): Failed to enable crypto [F:\xampp\htdocs\mobiletopup\SMTP.php line 392]
2021-09-01 16:40:53 Connection failed. Error #2: stream_socket_client(): unable to connect to ssl://smtp.zoho.eu:465 (Unknown error) [F:\xampp\htdocs\mobiletopup\SMTP.php line 392]
2021-09-01 16:40:53 SMTP ERROR: Failed to connect to server: (0)
SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting
SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting

Plz suggest.