Are you using mail receiver for inbound emails? have you followed the howto properly?
because that email does not exist on discourse.
Since discourse isn’t an email application, replying without an associated topic isn’t possible.
what logs? did you see:
mail-receiver logs can be found by ssh’ing into your server and
cd /var/discourse
./launcher logs mail-receiver
This has nothing to do with mail-receiver, You have to configure bounce notification with your ESP and follow this guide:
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