How would that work? The email address generally has the ISP's domain name in it.
Similar as it happens for phone numbers, where there is internal routing of phone calls between providers. A customer can be at a different provider with their phone number than the provider who “owns” the containing block of numbers.
alt Hacker News
Similar as it happens for phone numbers, where there is internal routing of phone calls between providers. A customer can be at a different provider with their phone number than the provider who “owns” the containing block of numbers.