Adding a second personal email address.

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@wkuras wrote:

Is it possible to add a secondary personal email address without having to add another user?

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I don't believe so.  Adding a 'new user' creates the additional email address.  

Thank you.

https://www.xfinity.com/support/articles/adding-new-user-names-or-email-addresses

For an additional user, the User Permission would be Viewer, which gives them access to only e-mail and the streaming app.