RSS Feed/News Email to users from my website failed: Process failed with exit code -1

[ENXF NET]

Hello,

Since XF2.3, when an email is sent from my server, I only receive server errors:

• Symfony\Component\Mailer\Exception\TransportException: Email to [email protected] from [email protected] failed: Process failed with exit code -1:
• src/vendor/symfony/mailer/Transport/Smtp/Stream/ProcessStream.php:60

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#0 src/vendor/symfony/mailer/Transport/SendmailTransport.php(119): Symfony\Component\Mailer\Transport\Smtp\Stream\ProcessStream->terminate()
#1...
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