COMCAST & SPAM Answered

Does Instructables know whether COMCAST.NET has blacklisted Instructables emails as spam? I have stopped getting any communications from Instructables. COMCAST reps can't find out who is on the blacklist, but they tell me to have Instructables ask COMCAST to be taken off the blacklist. (Comcast must have once blacklisted Kafka and he tried to get off the list.)