pipe.php permissions were reset to 644 after an auto-upgrade, causing all inbound piped emails to fail with exit code 127.
Set pipe.php permissions back to 755 (chmod 755 pipe.php). Exit code 127 means the file was not executable. Avoid relying on auto-upgraders; always upgrade osTicket manually. Exit code 255 means the script crashed.
Originally sourced from forum.osticket.com . osFAQ.org summarises community knowledge for quick reference.
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