Email error when replying to oracle EBS generated Workflow emails

Hi,

We enabled purchase order acknowledgements.

Oracle Purchasing workflow generates an email requesting suppliers to acknowledge the Purchase order.

We are implementing iSupplier portal too.

when the supplier clicks accept or reject in the email and clicks reply, we are getting below error.

Please advice a solution.

When Office 365 tried to send your message, the receiving email server outside Office 365 reported an error.

daniela.k Office 365 wfdev7 Sender Action Required Policy violation or system error

How to Fix It Check the "Reported Error" from the "Error Details" section shown below for more information about the problem. The error might tell you what went wrong and how to fix it. For example, if the error states that the message was blocked due to a potential virus or because the message was too large, try sending the message again without attachments.