First of all, you must ACCEPT a malformed email AND then you can apply the fix to it
The event smtp_server_message_received is onlyt triggered once Kumo accepts a message
It can’t accept a message unless you override the line length first
So your code to apply check_fix_conformance does not even run
@optimistic-whale You are right. Thanks for the update
@optimistic-whale thank you for explaining that more clearly . Not sure why I was being misunderstood.