http://cbl.abuseat.org/nat.html http://cbl.abuseat.org/advanced.html
Some places NAT you without telling you. This has happened on cable modems. Are you sure your IP is the one you think it is?
I further highly doubt any link between Gmail and CBL exists.
There is no link. What could be happening, and it is really grasping at straws, is you send a mail to A @ gmail that forwards to B @ cbl trap. (And I did not report :-) This is why I think it might be nat fun. Anyway, cbl listings expire fairly quickly if you don't keep hitting them. Try pointing your outgoing mail at your ISP's mail server and let them do the delivery.
