Can Apple support .ca custom domains?
Does Apple support .ca domains?
[Re-Titled by Moderator]
Original Title: Custom Domains
MacBook Pro 14″, macOS 15.6
Per the Canadian internet registration authority (CIRA, the folks that administer .ca), yes.
You’re the one that is providing DNS services to reference the Apple iCloud mail servers for this usage via your registrar:
Set up an existing domain with iCloud Mail - Apple Support
Full setup: Add an email domain you already own to iCloud Mail on iCloud.com - Apple Support