To be able to retrieve any of your old email you will need to contact Comcast at the information i have provided below and if they still have this information stored on their servers they should be able to forward you this data.
We're here for you 24/7. Just Ask Comcast.1-800-COMCAST (1-800-266-2278)
Hope this helps,
You are very welcome hopefully they will still have these emails stored on their servers and can forward them to you.
Thank you for the Accept,