For Fort McMurray evacuees - Many lenders will suspend or reduce your current mortgage payments if you notify them of your situation.
Mortgage contact numbers for several major lenders are listed below: 

Call your lender to make arrangements to limit the impact to your credit.
ATB 1-800-332-8383
Bridge Water 1-866-243-4301
Canadiana Financial Corp.
Phone: 1-877-315-1633, Option #6
Email: CFCmortgagesupport@canadianafinancial.com
CFF Bank 1-855-767-3031
CIBC 1-877-454-9030
First National customers 1-866-577-5509.
Genworth 1-800-511-888 or email homeassist@genworth.com
Home Trust 1-855-270-3630
MCAP customers please contact 1-800-265-2624
Merix/Lendwise Phone: 1-877-637-4911, Option #6 or Email: customerservice@merixfinancial.com
National Bank 1-888-835-6281
Radius Financial 1.866.550.8227
RBC 1-800-769-2511
RMG 1-866-809-5800
Scotia 1-800-472-6842
Servus Credit Union 1-877-378-8728
Street Capital 1.877.416.7873 or customerservice@streetcapital.ca
TD Bank Customer Service 1-866-222-3456