Send email and get error 521 Upstream error

I’m trying to use the email routing service, but it’s not working. 521
My domain is “”.

When I try to send messages to my email “{redacted}”, from other providers (gmail, outlook, yahoo) I get the return message below.

When I try to send messages through my account “{redacted}” in my webmail, the message is normally only sent to some providers.

Here’s the error message I get in the first case - Screenshot by Lightshot

I look forward to help if possible!


It’s because there’s a infinite loop in your configuration, we recommend using a Gmail/Outlook or similar address to forward to.

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Okay… but which item?
In catch-all?

For that I need to add a Gmail or Outlook email in the destination address… is that what needs to be done?

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