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Topic: 550 5.7.1 Sender ID (PRA) Not Permitted

iRedMail with MySQL backend.
I get this error sending from internal domain A to external domain B...

What to check?

thanks & regards

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Re: 550 5.7.1 Sender ID (PRA) Not Permitted

Looks like SPF or something similar, not sure.
It's better to contact admin of domain B to solve this issue.