SMTP without encryption

Since 2.3.0 upgrade my emails are not working anymore:

Symfony\Component\Mailer\Exception\TransportException: Email to from failed: Unable to connect with STARTTLS: stream_socket_enable_crypto(): SSL operation failed with code 1. OpenSSL Error messages: error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed src/vendor/symfony/mailer/Transport/Smtp/Stream/SocketStream.php:171
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I read through some resolved bug reports, but they all discuss how to fix...

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