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Comcast does not give its customers a way to whitelist senders. All you can do ask for help from their Security Assurance group, which manages spam blocking. Give them a call at 1-888-565-4329 (from http://constantguard.comcast.net/help/report-abuse/). Note that this is NOT one of the general customer service numbers.
The first-line reps there are sometimes not very helpful. If so, be persistent, and keep at them until you get a satisfactory answer.