Email routing giving "521 5.3.0 Upstream error"

I activated email routing on my domain, but I can’t seem to get it working. All DNS options are in place, I have a catch-all forward, but I always get the following error message when sending an email:

<[email protected]>: does not like recipient.
Remote host said: 521 5.3.0 Upstream error
Giving up on
STARTTLS proto=TLSv1.2; cipher=ECDHE-RSA-AES256-GCM-SHA384; subject=/C=US/ST=California/L=San Francisco/O=Cloudflare, Inc./CN=*; issuer=/C=US/O=DigiCert Inc/CN=DigiCert TLS RSA SHA256 2020 CA1;

Is there a way to reach the CloudFlare email team so they can fix this? It seems like a bug.



Cloudflare email team here. Could you please send me the domain you are using so I can have a look? Either here or sven (at) cloudflare. Thanks

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