Cloudflare Email Routing - Received Error Bounceback

Greetings, I’m now using Cloudflare email but unfortunately its not routing accordingly. I tested to sent an email and i received bounceback message as per below:
Mail delivery failed: returning message to sender

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

[email protected]
host []
SMTP error from remote mail server after RCPT TO:[email protected]:
521 550 Upstream error

Note: [email protected] is my email address

All Email DNS records done setup and verified

Kindly advise and assist further…

Thanks in advance, regards!

Thanks for the report. What domain are you using?

Have you tried to turn off and on again the catch-all in the dash? that will force the configuration to be published again

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My domain is

Yes already.

Thank you in advance, regards.

@faizfaizun The upstream is rejecting the emails, could you please send me an email at sven (at) cloudflare. I’ll send you the error that we are seeing.

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sorry, email to sven (at)

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Yes please

Okay sure, email sent.

Thank you very much, regards.

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