Nasıl Yapılır? xenForo 2.3 mail smtp Hatası

Symfony\Component\Mailer\Exception\TransportException: Email to seeker.turkey@gmail.com from root@demo.com failed: Process failed with exit code 11: 550 Local sendmail disabled for u974160534 contact support src/vendor/symfony/mailer/Transport/Smtp/Stream/ProcessStream.php:74

[HEADING=2]Yığın izleme[/HEADING]
#0 src/vendor/symfony/mailer/Transport/SendmailTransport.php(120): Symfony\Component\Mailer\Transport\Smtp\Stream\ProcessStream->terminate()
#1...