My mom's residential address was Bangladesh and mailing address was Canada from day 1. She was here with me on Supervisa when we applied for PGP in 2015. Coincidentally, my mom (along with my family) is in Bangladesh "vacationing" while I received the SA & File Transfer email on 3-Jun-2016 (I changed my mom's home address from Bangladesh to Canada in her E-Cas just a few days before 3-Jun; so it didn't come into effect). Then, my mom received PR AOR email (stated in above post) from LVO on 14-Jun-2016. Her E-cas is showing Canadian address now and she will be back with me next month.
So, yes, I'm happy that LVO communicated via email hoping that they would continue to do so in future.