In attempt to have the block removed, I have reached out to the USPS abuse contact email provided in the network segment ownership information. Regrettably we do not have an eta on the matter, however as a quick workaround, your developer can change the local IP used for the cURL requests to XXX.XXX.XXX.XXX, which will show no issues when querying production.shippingapis.com directly no matter the IP it resolves to.
Further updates on the IP block will be provided as they become available, thank you for your patience.
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