said by J D McDorce :

There is a huge difference, both technologically and philosophically, between filtering email traffic and non-email data traffic (such as posting on this site).

said by nozzer :

Also, if you look at my profile you will note I'm an RCN subscriber, not Comcast.

said by NormanS :

Which in no way reduces your obligation to try to make a first hand validation of the claim. It just means that you would have to enlist the aid of a Comcast customer to validate the claim.

said by nozzer :

The troubling thing is that this is the second time brightmail have decided to block emails containing links to what could be described as "sites with left of center views". I doubt its Brightmail, more likely a lone tech who made this decision.
If it were for instance Rush Limbaughs site, you could be sure there would be lots of people here screaming foul, and Brightmail/Comcast would be accused of being a communist run organization.

said by nozzer :

Which is why I posted the question in the comcast forum. Please pay attention.
It would seem from many other reports that there was indeed a problem, it was with BRIGHTMAIL (the service comcast uses to send/receive email), and they removed the block around the time my post appeared. The troubling thing is that this is the second time brightmail have decided to block emails containing links to what could be described as "sites with left of center views". I doubt its Brightmail, more likely a lone tech who made this decision.
If it were for instance Rush Limbaughs site, you could be sure there would be lots of people here screaming foul, and Brightmail/Comcast would be accused of being a communist run organization.