Is it possible to have two separate Comcast email accounts?

Yes

There are some articles online about it but pretty sure you just log into your account and go to "users" where you can create up to 6 additional accounts with their own email address and password.

Make sure to restrict as needed so they can't get into/change your billing etc.

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@JAYGEEE wrote:

Is it possible for me to have 2 email accounts that I can log on with different usernames and PWs.  If yes, are there instructions how to do this?

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You can have up to 6 secondary accounts in addition to your Primary. Here are the instructions-------

http://customer.xfinity.com/help-and-support/internet/adding-new-user-names-or-email-addresses/