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Fatal error: Uncaught Symfony\Component\Mailer\Exception\TransportException: Process failed with exit code -1: in /www/lib/comp-vendor/symfony/mailer/Transport/Smtp/Stream/ProcessStream.php:60 Stack trace: #0 /www/lib/comp-vendor/symfony/mailer/Transport/Smtp/SmtpTransport.php(272): Symfony\Component\Mailer\Transport\Smtp\Stream\ProcessStream->terminate() #1 /www/lib/comp-vendor/symfony/mailer/Transport/Smtp/SmtpTransport.php(359): Symfony\Component\Mailer\Transport\Smtp\SmtpTransport->stop() #2 /home/plantoq/www/user/mod.php(332): Symfony\Component\Mailer\Transport\Smtp\SmtpTransport->__destruct() #3 /home/plantoq/www/user/index.php(57): include_once('/home/plantoq/w...') #4 /home/plantoq/www/templates/admin/2021/index.php(72): include_once('/home/plantoq/w...') #5 /home/plantoq/www/admin/index.php(74): include_once('/home/plantoq/w...') #6 {main} thrown in /www/lib/comp-vendor/symfony/mailer/Transport/Smtp/Stream/ProcessStream.php on line 60

this is not a bug settings issue due to OVH it seems

• https://community.ovh.com/t/Envoi-mail-Symfony-messenger-depuis-un-H%C3%A9bergement-OVH-web-PRO/60432/3 and https://www.php.net/manual/en/function.urlencode.php
• https://github.com/symfony/symfony/issues/42813
• https://github.com/symfony/symfony/issues?q=is%3Aissue+mailer+ovh+

See : https://github.com/symfony/symfony/discussions/57443

https://github.com/symfony/mailer/compare/v5.4.21...v5.4.40