XenForo Email to from failed

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Email to from failed: Connection could not be established with host "ssl://smtp.protonmail.ch:587": stream_socket_client(): SSL operation failed with code 1. OpenSSL Error messages: error:0A00010B:SSL routines::wrong version number


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Server error log

    Symfony\Component\Mailer\Exception\TransportException: Email to from failed: Connection could not be established with host "ssl://smtp.protonmail.ch:587": stream_socket_client(): SSL operation failed with code 1. OpenSSL Error...

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