I am trying to send an email using Shaw Webmail to a Contact Group but am getting the following error when I press Send:  

I have clicked Show Details, but it doesn't say anything more, except for the software code for the message. I've tried Send Error Report, but I don't receive anything. I've gone over all my email addresses to make sure they are valid and they all seem to be. I've sent messages to this group before without any problems so not sure why it is happening now. Could it be because I am sending from overseas rather than home this time? 

Any suggestions? 

Thank you. Clarence