Bug users can't register on forum

[diego222]

Hi

Yesterday I upgraded to 2.3 and now users can't register on my forum because they are not receiving the confirmation mail.

The error I get on my forum panel is:

• Symfony\Component\Mailer\Exception\TransportException: Email to from failed: Unable to connect with STARTTLS: stream_socket_enable_crypto(): Peer certificate CN=`*MYMAILHOSTINGSERVER' did not match expected CN=`localhost'
• src/vendor/symfony/mailer/Transport/Smtp/Stream/SocketStream.php:171

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