stream_socket_enable_crypto(): SSL operation failed with code 1

  • After upgrading PHP to 5.6 or 7, every attempt to send an email fail and the following error message is shown:

    Warning: stream_socket_enable_crypto(): SSL operation failed with code 1. OpenSSL Error messages: error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed in E:\Projects\test\wp-includes\class-smtp.php on line 368

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