I am unable to find a way to change the email address for a customer. These are portal only customers. When they log in and click on their profile button they do not see the option to change it and neither do I when logged in as an administrator.
If you are using Cloud (as I suspect) you are probably facing this - https://jira.atlassian.com/browse/JSDCLOUD-5746 so it is not yet implemented. For Server you should be able to change the email address simply by going to User Management
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