Can't find config file

Hello, we installed Zammad 5.3 and now we have a bag with auto-reply.
We had a few of auto-replyes from zammad from our previous tickets but now there’s no auto-reply for client when he create a ticket at all.
We thought that there’s a question with SMTP but we’re not sure. Can you help us find a config file or solution how to solve this bug?

Tank You!

There’s no configuration file.
I’m assuming you have issues with your triggers so the following documentation page would be relevant:
https://admin-docs.zammad.org/en/latest/manage/trigger.html

Your production.log might also help you. (/var/log/zammad/)