GMAIL Notice from MAIB sent email: "Why is this message in Spam? It has a from address in but has failed's required tests for authentication."

Any ideas how I fix this?

Try and see what it says. It will also help you fix issues.

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Also, are you absolutely sure that MiaB sent that mail? It’s common for programs to try to send mail on your behalf.

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I know this is a bit old but this error most likely indicates a SPF policy failure, probably a soft fail on the sender SMTP IP for the sending main domain.

Hope this helps.