I emailed them too and received the following message:
"Good day,
THIS IS AN AUTOMATIC REPLY.
PLEASE READ ENTIRE EMAIL FOR FURTHER INSTRUCTIONS.
You will NOT receive a response to your enquiry via this email. A decision/response to your request or notification of submission will be added to your file in our system within 3 business days of receipt. At that time, you must contact the Client Support Centre for further information.
This mailbox should
ONLY be used to provide requested documentation or to provide a reasonable explanation for not being able to attend an online test, interview or ceremony (with documentary evidence). Please ensure your email includes your full name, file number and UCI.
Any requests received other than those outlined above will be automatically deleted and not processed.
If you are experiencing technical issues before accessing the online test, please contact
IRCC.CitOnlineTest-TestenligneCit.IRCC@cic.gc.ca "