Another way to look at is: email domains are like international country codes. For example, you can't port a US number to a Korean number. I'm sure it's techn

Another way to look at is: email domains are like international country codes. For example, you can't port a US number to a Korean number. I'm sure it's technically feasible to port international phone numbers, but I don't think it will happen. Perhaps email portability is similar in this respect. I realize there isn't much portability even within an email domain, but it does exist in some forms (maybe like how phone number portability may not be available in all countries): - Very unique case, but I know a certain Google employee whose email suddenly changed from OLD@gmail.com to NEW@gmail.com in my chat history. A search for NEW@gmail.com results in emails from both addresses (both highlighted), so they are linked somehow. And emails to OLD@gmail.com are still received.