1101 appears in the mail processing worker

I also have a worker whose role is to receive emails and store them in an external database. When I access the dev domain, Error 1101 is returned.
Worker threw exception, I used the service provided by cloudflare, catch-all, to execute your Worker by creating a custom address in the email route.
I tried sending to worker mail and it returned
host route2.mx.cloudflare.net[162.159.205.18] said: 550 5.1.1 Address does not exist. 0pJIJLUPfZMG (in reply to RCPT TO command)
I don’t understand if mail traffic is processed by workers?

I also have a worker whose role is to receive emails and store them in an external database. When I access the dev domain, Error 1101 is returned.
Worker threw exception, I used the service provided by cloudflare, catch-all, to execute your Worker by creating a custom address in the email route.