you have to love comcast. They just blocked my port 25 incoming. A quick search around the net reveals they are jerking people around regularly on this issue.
The weird part: at last one person claims the blocking is done in the cable modem, and can be resolved by just getting a new modem. Does this seem like a realistic claim? I just assumed it was in the routers. Here's one transcript. ron http://www.johnmasone.com/article.php?id=150