E-mail error message

Hi!
Im trying to set my e-mail configs to use on Contact form 7, but it keeps sending me error messages on all my tests. Can someone help me to solve this problem?

I’m using the Other SMTP mailer.

Versions:
WordPress: 5.0.3
WordPress MS: No
PHP: 5.6.39
WP Mail SMTP: 1.4.1

Params:
Mailer: smtp
Constants: No
ErrorInfo: SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting
Host: smtp.paranapuan.com.br
Port: 587
SMTPSecure: tls
SMTPAutoTLS: bool(true)
SMTPAuth: bool(true)

Server:
OpenSSL: OpenSSL 1.0.2q 20 Nov 2018
SMTP Debug:
2019-01-14 15:58:01 Connection: opening to smtp.paranapuan.com.br:587, timeout=300, options=array (
)
2019-01-14 15:58:01 Connection: opened
2019-01-14 15:58:01 SERVER -> CLIENT: 220 smtp-11.smtp.mandic.prv ESMTP
2019-01-14 15:58:01 CLIENT -> SERVER: EHLO paranapuan.com.br
2019-01-14 15:58:01 SERVER -> CLIENT: 250-smtp-11.smtp.mandic.prv
250-PIPELINING
250-SIZE 52428800
250-VRFY
250-ETRN
250-STARTTLS
250-AUTH PLAIN LOGIN
250-AUTH=PLAIN LOGIN
250-ENHANCEDSTATUSCODES
250 8BITMIME
2019-01-14 15:58:01 CLIENT -> SERVER: STARTTLS
2019-01-14 15:58:01 SERVER -> CLIENT: 220 2.0.0 Ready to start TLS

Warning: stream_socket_enable_crypto(): Peer certificate CN=*.idc2.mandic.com.br' did not match expected CN=smtp.paranapuan.com.br’ in C:\Inetpub\vhosts\paranapuan.com.br\httpdocs\wp-includes\class-smtp.php on line 369

2019-01-14 15:58:04 SMTP Error: Could not connect to SMTP host.
2019-01-14 15:58:04 CLIENT -> SERVER: QUIT
2019-01-14 15:58:04 SERVER -> CLIENT:
2019-01-14 15:58:04 SMTP ERROR: QUIT command failed:
2019-01-14 15:58:04 Connection: closed
2019-01-14 15:58:04 SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting

The page I need help with: [log in to see the link]