I tried now, and there’s the unprocessed emails:
zammad@a7f54cac6be2:~$ ls var/spool/unprocessable_mail/
540f8fcda385a50a179ab41de767762e.eml 6ea565e099df8c1bcd9c92b93dbba2c8.eml
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Email ticket doesn't work when Storage Mechanism is changed to S3
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