Attempted Delivery to: default-non-local-route 422 license expired

Hi All,

My user complaints that they cannot send some email to one particular sender with some attachment. Hence they reeived the NDR like the following:

Delivery is delayed to these recipients or groups:CFO@Customer.com

Subject: RE: Company Pty Ltd - URGENT

This message hasn't been delivered yet. Delivery will continue to be attempted.

So I open the Brightmail gateway, I found out that it has got Success with Errors Details:

Transient Delivery Attempts Failure 
Attempted Delivery to: default-non-local-route  ​

422 license expired 

Does that means the target email server license is expired and our Brightmail is holding on the email ?