Question : What is the meaning of this email bounce back message

Someone outside our office send email to one of our Shaw email address and the receipt cannot receive the email. According to the sender, the error message is as follows:

Your message did not reach some or all of the intended recipients.

     Subject:  Exhibits
     Sent:     11/20/2008 4:14 PM

The following recipient(s) could not be reached:

     [email protected] on 11/20/2008 4:14 PM
           A conversion required for the message to be delivered has been prohibited by the originator
           

May I know what is the meaning of the error code mentioned above and how to fix it.

Please kindly advise ASAP.

Answer : What is the meaning of this email bounce back message

Don't worry. Just finish talking to Shaw tech support and resolve the problem from their end, so please close this Case.