Congratulations
@hamo9ody for starting your spouse's process.
Abu Dhabi office does not accept emails or faxed applications. you need to fill them, sign where it is applicable, collect other supporting documents and send them by mail to their mail address:
Canadian Embassy
Immigration Section
10th Floor Abu Dhabi Trade Tower
West Tower, Abu Dhabi Mall
PO Box 6970
Abu Dhabi
United Arab Emirates
As per the email we received from them, VO Abu Dhabi does not acknowledge receipt of mail or documents. You need to send it by courier and check the delivery using your shipment tracking number.
They have two email addresses, you can use them to ask questions and communicate:
ABDBIIMMIGRATION@international.gc.ca
abdbi-im-enquiry@international.gc.ca
Wish you all the luck!