My port 25 blocking problem today. After 2 tier 1 support people and a supervisor telling me there was nothing that they could do and to call Microsoft, I was finally routed to the Comcast abuse team…
1(888)565-4329 (make a note of it)
Or
abuse@comcast.netThey finally verified that they had indeed blocked port 25 on my modem and after a 20 minute reset, it was unblocked and now works. No one knew anything about it until I got to the abuse team. I was not notified before they blocked it. They can unblock it if you yell loud enough.