Email forwarding: error 521

I activated email routing on my domain, but I can’t seem to get it working.
All DNS options are in place.

I always get the following error message when sending an email:
521 5.3.0 Upstream error, please check Postmaster · Cloudflare Email Routing docs for possible reasons why. hOJAbsbtYEqJ

I followed the steps in the documentation. I don’t understand why it doesn’t work

Are you able to provide a screenshot of the error?

Can you provide the sending and receiving email address?

thank for your support.
I tried to send an email from Gmail to an address (my domain)

The response from the remote server is:
521 5.3.0 Upstream error, please check for possible reasons why. gsHUTohGG7Ft

I am also experiencing this issue. I have had the route in place for months, but it hasn’t been working for days. I had to change the address it forwarded to from gmail to my old college email and it started working again, otherwise it bounces with that 521 error.

Any insight here?

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