icloud+
icloud+ allows you to use a custom domain name with up to 3 email addresses. Can each family member create up to three additional emails using the same domain name?
iPhone XS, iOS 14
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Yes. 3 email address on your custom domain per iCloud account that is part of Family Sharing. :)
Though I wish that we can have more. Looking forward to iOS 16 release, when it can support other iCloud accounts even outside of Family Sharing.