The rejection viewer displays messages sent to your email address that Mimecast has rejected. This generally applies to inbound emails. Rejected messages are those that are rejected in protocol, meaning the message's content hasn't been accepted. When this occurs, a non-delivery report is generated by the sending mail server and returned to the original sender of the message.
The rejection viewer can be used to display information about why we rejected it. If the message was legitimate, you can use this information to address the cause of the rejection and allow the message through on the next send attempt.
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