I would probably just email both just in case@mstefan did u get your first portal email from IRCC.ClientPortalOntario-OntarioClientPortail.IRCC@cic.gc.ca or from IRCC.ClientPortal-PortailClient.IRCC@cic.gc.ca. Mine came from Etobicoke office.
My lawyer asked me to email the second address but i saw the original email came from the first address...