Added to Spamhaus ZEN
So, for some time now, my home IP address (Comcast assigned) has been listed on the Spamhaus mail server blacklist monitor. The modem is an XB3 and there is no logical reason for the issue to have started in the first place. There are no servers running here nor has there ever been. Now I find out the block was put on by Comcast itself - Spamhaus PBL is a DNSBL database of end-user IP address ranges which should not be delivering unauthenticated SMTP email to any Internet mail server except those provided for specifically by an ISP for that customer's use.
So Spamhaus can't pull the block since Comcast started it. And I cannot request a new IP address for the XB3 since it is a rental.
Anyone have any ideas? I am trying to avoid swapping XB3s because the rocket scientists @Comcast will probably reissue the same IP on the new box once I hook it up.