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While not common, this has been seen before. Their procedures are automatic, and not exactly fine-tuned. And they apply to only individual IP addresses, not Gmail as a domain.
The best thing to do is probably follow the instructions on that page to submit a support form to have your IP address delisted. (Anyone using that address can make a request).
I noted that the record was old (2003), so there may be no reason that they would not honour such a request.
It's a little time-consuming, and it may take a while for the your ticket to be processed, but I think it's your best chance of getting back in business in a timely manner. (Although there are no guarantees.)
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