i have a problem with Cloudflare E-Mail (Beta).
i have the same Error: Email routing giving "521 5.3.0 Upstream error"
Another domains working without any problems.
Only one domain is not working with a specific adress [email protected]
Any idea, why this domain with the same settings/szenario and address is not working?
I can send my domain via PM, if u want.
SMTP error from remote server for TEXT command, host: amir.mx.cloudflare.net (188.8.131.52) reason: 521 5.3.0 Upstream error. fr3pl98HNKBx