Hello @JD ,
Welcome to our Q&A forum.
Based on the error message you provided, it seems that your Exchange server blocked the email from Microsoft due to a Sender ID (PRA) Not Permitted error. This error occurs when the sender’s domain does not have a valid Sender Policy Framework (SPF) record or if the SPF record is not configured correctly.
To resolve this issue, you can check if the SPF record for Microsoft’s domain is configured correctly. You can use the Microsoft Remote Connectivity Analyzer to check if the SPF record is valid. If the SPF record is not valid, you can add it to your list of allowed domains.
Please feel free to let us know if you have any updates.
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